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This Key Stage 3 Constructions and Scale Drawing scheme of work is designed for Year 8 work on constructing triangles using compasses and protractors, bisecting angles and lines, perpendicular bisectors, angles of elevation and depression, and scale drawings of bearings.
Use this page to sequence the lessons below, keep construction technique vocabulary precise, and connect ruler-and-compass methods to the geometric reasoning students will meet in congruence and loci work.
Last updated: May 2026
For more schemes and topic routes across KS3, GCSE and A-Level, browse the Mr Mathematics Curriculum Hub.
Read the prerequisite and key-concept cards first so angle measurement, acute/obtuse/reflex classification and basic geometric notation are secure. Teach the lessons in the order listed unless your timetable requires otherwise — keep triangle constructions before bisectors, and introduce angles of elevation and bearings after students can construct and interpret scale drawings confidently.
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If you are comparing options for a department, the membership page sets out exactly what is included so you can align this unit with your wider KS3 geometry and measures plan.
Students should be secure with the following before this unit.
Ideas to keep explicit while students work with constructions and scale drawing.
How this unit supports fluency, reasoning and problem solving in Key Stage 3.
Typical slips to address during teaching and marking.
Use it to sequence teaching, align vocabulary and spot likely errors before they become habits. Then use the lessons below as the delivery route for the unit.
They need confident angle measurement and classification, knowledge of angle facts on a straight line and at a point, and basic geometric notation so new work focuses on construction technique, bisectors and scale rather than revisiting measurement fundamentals.
Each lesson listed below has its own page with downloadable resources and, where available, online tasks. Access depends on your membership level.
Yes if your timetable requires it — keep triangle constructions and bisectors before scale drawing applications, and introduce bearings after students can construct and read angles of elevation and depression confidently.
Additional revision lessons, exam-style questions and topic-based practice are available on the GCSE Maths Revision Hub. This is useful for consolidating learning after teaching the unit or for Year 11 exam preparation.
Students learn how to construct triangles using compasses and protractors.
As learning progresses, students are challenged to measure angles and lines to scale and construct quadrilaterals.
Students learn how to construct an angle bisector using a pair of compasses and a ruler.
As learning progresses, they are challenged to use angle bisectors to identify an equidistant path between two lines.
Students learn how to construct perpendicular bisectors using a pair of compasses.
As learning progress, students are challenged to bisect a line at a given point and to find the shortest route between a point and a line.
Students learn how to construct scale drawings of angles of elevation and depression.
As learning progresses, students are challenged to decide their scale and investigate similar shapes.
Students learn how to construct scale drawings of bearings.
As learning progresses, students move from constructing scale drawings of bearings to interpreting diagrams using ratios.
Related Blog: Teaching Bearings Outside
Additional practice constructing angle and perpendicular bisectors.
The problem-solving activity challenges students to use angle bisectors to identify a locus.
Students revise how to construct triangles and circles using a pair of compasses, protractors and rulers.
Later, as learning progresses, they link to scale drawing and writing ratios in form 1 : n.
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