Construct other two-dimensional shapes
Construct a rectangle, parallelogram, rhombus and centred isosceles trapezium from sufficient labelled data, retaining instrument evidence and measuring checks.
Exam scope and assessment notes
Shared Foundation/Higher Construction covers F4.5A–D: measurement and drawing, triangles and other 2D shapes, scale drawings, and both straight-edge-and-compasses bisectors. These six original lessons are linked to those syllabus rows; the links do not establish complete textbook coverage or specialist approval. Use the named instruments and retain your marks, arcs and joins. A numerical answer or displayed reference alone does not show instrument skill. Physical millimetre work needs a real ruler and a verified object or calibrated print; recheck calibration after printing, resizing or zooming. Measure only diagrams explicitly supplied as accurate for measurement. Virtual drawing units do not certify physical millimetres. Written answers and model comparisons are for self-checking, with no marks, mastery or formal assessment approval. The source is linear 4MA1 Issue 2, checked against November 2026/June 2027 entry context; regional options depend on centre eligibility. Modular qualifications remain separate. Publisher chapter links are navigation aids: the relevant final chapter body and Teaching Hub content remain unverified. Other syllabus sections remain separate.
Before you begin
- Construct and measure calibrated segments and protractor angles.
- Use known rectangle, parallelogram, rhombus and isosceles-trapezium conditions.
- Transfer equal lengths with compasses and follow a labelled vertex order.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which condition must be constructed at an adjacent corner of a rectangle?
What you will learn
- Combine ruler lengths, protractor directions and compass transfers to construct complete ordered boundaries.
- Use sufficient data and choose the intended circle intersection rather than relying on appearance.
- Check stated quadrilateral conditions and measure requested diagonals or sides after construction.
Place your own instruments and retain the joins, rays and arcs. The givens are shown first; your construction stays at the positions you choose.
Worked construction
Construct rectangle ABCD with AB=6 cm and AD=4 cm, using ruler, protractor and compass length transfers as appropriate. Retain the right-angle rays and transferred-length marks. Complete the boundary in order and measure diagonal AC to the nearest millimetre on your own drawing.
Drawing unit: cm. Printed graduations calibrate the virtual drawing; they do not certify physical paper or monitor size.
All submitted joins and arcs stay visible. Select a recorded ruler or protractor to inspect its graduations; other instruments retain their actual footprints. Long lines and rays are cropped to this viewing frame.
Coordinates describe the virtual drawing in cm; they are placement controls, not endpoint readings. Positive angles turn anticlockwise; negative sweeps turn clockwise. Clicking chooses a visible position. It does not move an instrument onto a reference answer.
Read or use my recorded ruler
These readings come from your actual ruler placement. A misplaced ruler keeps its offset; this tool does not report the ideal endpoint reading.
Find intersections of my retained traces
Intersections use the actual arc sweeps and line extents. A full circle or supporting line cannot supply a crossing outside a traced arc, ray or segment.
This is a fixed mathematical comparison. A complete written response records an attempt; a teacher still needs to review the reasoning. Virtual graduations do not establish physical ruler, protractor or compass skill, and no marks or mastery are awarded. Verify physical calibration and recheck it after any print or zoom change.
Translate conditions into instrument operations
Read the vertex order before drawing: ABCD means join A to B to C to D and back to A. Establish a labelled base with a ruler, then turn each remaining condition into an operation. A right angle needs a properly aligned protractor ray; an equal distance can be transferred with compasses. Retain the rays and arcs so another person can see how the given conditions were met.
A named family alone does not give all the needed dimensions. A rectangle needs adjacent lengths and right angles, while two adjacent lengths of a parallelogram still leave its opening angle free. Use the supplied angle or other sufficient condition to determine the intended drawing. If a condition is missing, say what remains undetermined rather than choosing a shape simply because it looks familiar.
Use intersections to complete the boundary
A point may need to be a given distance from two already located vertices. Draw a circle or arc with each distance as its radius and use a crossing that satisfies the boundary order and the stated side of the base. There may be another circle crossing; check it against the requested shape rather than assuming every crossing gives the same quadrilateral.
For a rhombus constructed from a diagonal and a side length, equal-radius arcs centred at the diagonal endpoints locate the two remaining vertices on opposite sides of that diagonal. For a centred isosceles trapezium, the difference of the parallel-base lengths is shared equally between the two offsets. Draw the perpendicular height and its perpendicular top guide before marking the shorter base. Those conditions must come from the givens, not from a precompleted reference picture.
Check the construction rather than replace it
Once the boundary is complete, recheck its required lengths, right angles, parallel sides and equal-distance transfers. Measure a requested diagonal or sloping side on the actual accurate drawing and report the requested precision. Its ideal model may contain an exact root, but no Pythagoras or coordinate calculation is required as the learner’s construction method here.
The geometric properties explain why the method works; they do not turn a visual resemblance into proof that the conditions were satisfied. Keep the given labels separate from newly measured values. Constructing one of these shapes does not automatically complete a separate symmetry, transformation or formal bisector programme, and a finished reference shown after the attempt does not establish that the learner used the instruments.
Sources for this lesson
Pause and explain
Two adjacent parallelogram lengths are 8 cm and 3 cm. Which additional datum can fix a nondegenerate opening?
Worked example
Construct rectangle ABCD with AB=6 cm and AD=4 cm, using ruler, protractor and compass length transfers as appropriate. Retain the right-angle rays and transferred-length marks. Complete the boundary in order and measure diagonal AC to the nearest millimetre on your own drawing.
Show the worked solution
- Draw AB=6 cm. At A construct a perpendicular ray on the chosen upper side; at B construct a perpendicular ray on that same side, using the correct protractor alignment.
- Transfer 4 cm onto the ray at A to locate D and onto the ray at B to locate C. Join D to C, retaining the right-angle and length-transfer evidence.
- Check opposite sides and right angles, then draw and measure AC. The ideal diagonal is about 7.211 cm, giving a nearest-millimetre reference of 72 mm, or about 7.2 cm.
- The diagonal reading checks the constructed rectangle but does not replace it. Keep the requested given side lengths distinct from the approximate measured diagonal.
Answer Construct the 6 cm by 4 cm rectangle with its right-angle and transfer marks. Diagonal AC has reference measurement about 72 mm=7.2 cm.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Construct parallelogram ABCD with AB=7 cm, AD=4 cm and ∠DAB=60°, using D above AB. Use a protractor and length transfers to locate the missing vertices. Retain the two circles used to complete C, choose the upper completion satisfying the vertex order, and measure both diagonals to the nearest millimetre.
Give me a hint
Locate D first. C must be 4 cm from B and 7 cm from D; test the circle crossing against the required parallelogram.
Compare my reasoning
- Draw AB=7 cm. At A construct the upper 60° ray and transfer AD=4 cm onto it with compasses to locate D.
- Draw an arc centred at B with radius 4 cm and an arc centred at D with radius 7 cm. Select their upper crossing as C, then join BC and CD in the stated boundary order.
- Check the opposite side lengths and parallel directions. The other circle crossing is below AB and does not give the requested upper parallelogram in this vertex order.
- Measure both diagonals. Ideal nearest-millimetre references are AC≈96 mm=9.6 cm and BD≈61 mm=6.1 cm. As an angle check, the interior angles alternate 60°,120°,60°,120°, but the numerical checks do not replace the construction.
Construct the upper parallelogram from the 60° ray and two transferred distances. Reference diagonal readings: AC≈96 mm=9.6 cm and BD≈61 mm=6.1 cm.
Look for these in your work
- Locate D with the named angle and the 4 cm transfer.
- Retain both completion arcs and justify the correct C crossing.
- Measure both diagonals and distinguish their approximate readings from the given lengths.
Construct rhombus ABCD with diagonal AC=6 cm and all four sides 5 cm. Use compasses to locate the two remaining vertices on opposite sides of AC. Join the vertices in boundary order, keep both arcs and measure diagonal BD on your accurate drawing.
Give me a hint
Each missing vertex must be 5 cm from both A and C. Use both circle crossings.
Compare my reasoning
- Draw and label the diagonal AC=6 cm. Draw equal-radius arcs of 5 cm centred at A and C.
- Use the two crossings on opposite sides of AC as B and D. Join A-B-C-D-A; taking both missing vertices on the same side would not give the requested boundary.
- The four boundary sides each inherit their 5 cm length from the compass radii. Check those transfers and retain the arcs.
- Join and measure BD. Its ideal reference is 8 cm, or about 80 mm. This is a measured construction check, not a request to calculate an unknown diagonal with private coordinates.
Construct the rhombus using both 5 cm arc crossings across the 6 cm diagonal. Reference measurement: BD≈8 cm=80 mm.
Look for these in your work
- Use the diagonal as the given base for the two equal-radius arcs.
- Locate both missing vertices on opposite sides and join the correct boundary.
- Retain the arcs, check all four side lengths and measure BD.
Construct an isosceles trapezium ABCD with AB=8 cm, DC=4 cm parallel to AB, perpendicular separation 3 cm, and the shorter base centred above the longer one. Use a ruler and protractor for the base, perpendicular height and parallel guide, and compasses for length transfers. Retain the height and parallel-guide construction. Measure a sloping side and diagonal AC to the nearest millimetre, and explain how the centred condition is used.
Give me a hint
Split the difference of the base lengths equally, and locate the upper guide by two right-angle operations.
Compare my reasoning
- Draw AB=8 cm. At A construct a perpendicular height AE=3 cm. Through E construct a line perpendicular to AE, so this top guide is parallel to AB.
- The total base-length difference is 8−4=4 cm, shared as 2 cm at each end. Along the upper guide mark D 2 cm from E and C 6 cm from E.
- Join AD and BC. Check that DC=4 cm, that the guide separation is 3 cm and that the two sloping sides agree, giving the specified centred isosceles trapezium.
- Measure one sloping side and AC. Ideal nearest-millimetre references are about 36 mm=3.6 cm for a sloping side and 67 mm=6.7 cm for AC. Keep the guide and right-angle evidence.
Construct the centred 8 cm/4 cm parallel bases at 3 cm separation. Reference measurements: sloping side≈36 mm=3.6 cm; AC≈67 mm=6.7 cm.
Look for these in your work
- Use the 3 cm perpendicular height and a genuinely parallel upper guide.
- Derive the equal 2 cm end offsets from the centred-base condition.
- Retain construction marks and measure the requested side and diagonal to the stated precision.
Common mistakes
- Joining vertices in the wrong order or accepting the wrong circle crossing.
- Assuming a named shape or two adjacent lengths uniquely fixes an opening angle without sufficient data.
- Giving calculated diagonals or a precompleted outline instead of retaining the requested instrument construction and measured checks.
What can you explain now?
All four sides of a rhombus are specified as 3 cm, but no angle or diagonal is supplied. Does that determine a unique non-square outline?
Compare with the explanation
No. The opening angle can vary; another sufficient condition such as an angle or diagonal is needed.
Equal side lengths constrain the family but allow differently slanted rhombi. A chosen appearance cannot supply the missing condition, and a square is a possible special opening unless excluded.
After trying it yourself, choose your next review. This is your self-assessment.
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Make it stick
Explain how given lengths and angles become ruler, protractor and compass operations. Describe a correct intersection choice and why measuring a diagonal is a check after constructing the full boundary.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.