Measuring and drawing angles (Edexcel GCSE Maths): Flashcards

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Measuring and drawing angles
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When to measure angles from diagram

Only if diagram is stated as 'accurately drawn'

Unit angles are measured in

Degrees (°°)

Tool used to measure angles

Protractor

Angle range shown on protractor

0° to 180°180°

Where to place protractor centre when measuring

On the vertex (corner point) of the angle

Which protractor scale to use

Scale that starts with 0° on the aligned arm

Definition of reflex angle

Angle greater than 180°180°

How to find reflex angle measurement

Measure smaller angle, subtract from 360°360°

Why estimate angle size before measuring

To check your final answer makes sense

Definition of acute angle

Angle less than 90°90°

Definition of obtuse angle

Angle between 90°90° and 180°180°

First step when drawing an angle

Draw one arm (baseline) with a ruler

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