Year 8 - Maths
Checking compass skills
Constructions
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
In this unit we develop skills in using a pair of compasses and ruler to construct various accurate shapes and angles including triangles, rhombi, perpendicular lines and angle bisectors.
Lesson Summary
You will learn to confidently use a pair of compasses to draw circles and arcs.
Key Notes
- A pair of compasses can be used to draw any circle.
- A pair of compasses can be used to draw circle with a particular radius.
- A pair of compasses can be used to draw part of a circle.
Vocabulary To Learn
- Pair of compasses: A pair of compasses is a tool which can be used to draw circles and arcs. A pair of compasses is sometimes referred to just as a compass.
Common Mistakes To Avoid
- When drawing circles, pupils may find that the start and end of their arcs do not join together.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
A pair of compasses can be used to draw any circle. A pair of compasses can be used to draw circle with a particular radius.
2. Use this key word in a maths sentence and explain it clearly. 'Pair of compasses'
A pair of compasses is a tool which can be used to draw circles and arcs. A pair of compasses is sometimes referred to just as a compass. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: When drawing circles, pupils may find that the start and end of their arcs do not join together. Correction: This can be caused by the pair of compasses opening or closing mid-drawing. Hold it with one hand and rest the pencil gently on the page.
More Lessons In This Unit
- Bisecting an angle Study Guide
- Constructing rhombi Study Guide
- Constructing triangles Study Guide
- Diagonals of a rhombus Study Guide
- Perpendicular bisector of a line segment Study Guide
- Perpendicular to a given line through a given point Study Guide
- Problem solving with constructions Study Guide
- Securing the skill of using a pair of compasses Study Guide
- Understanding constructing a circle Study Guide
Browse all guides in the Year 8 Maths guide library.