An angle is a measure of turn. It is often displayed as the rotation between two line segments.

An angle that is greater than a straight line (i.e. greater than 180°) is a reflex angle.

Checking and securing understanding of angle notation and drawing/measuring angles

Maths

In this unit, pupils applied their understanding of angles to solve increasingly complex problems. In the future unit, pupils will use their mathematical reasoning to derive and use various circle theorems. 

In the prior unit, pupils learnt how to identify corresponding, alternate and co-interior angles. In this unit, pupils use their knowledge of these angles to reason through and solve more complicated problems.

Angles

In which of these images is the protractor in a correct position to measure the marked angle?

What is the size of the angle marked $$x$$?

The size of the angle marked $$x$$ is {{}}°.

The three letter notation for the marked angle is ∠{{}}. 

An {{}} is a measure of turn. It is often displayed as the rotation between two line segments.

Which of these is an instrument used for measuring an angle?

Which of these units is used to measure angles?

An angle that is smaller than a right angle is called an {{}} angle. 

An angle that is greater than a right angle but smaller than a straight line is called an {{}} angle. 

An angle that is greater than a straight line (i.e. greater than 180°) is called a {{}} angle.

This lesson will soon be taken down.

Checking and securing understanding of angle notation and drawing/measuring angles

Lesson outcome