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

A sector is the region formed between two radii and their connecting arc.

Checking and securing understanding of basic angle facts

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

Angles that meet at a point on a straight line sum to {{}}°.

Vertically opposite angles are __________.

The size of ∠BEA is 70°. Therefore the size of the obtuse angle ∠CEB is {{}}°. 

The size of ∠BEA is 70°. Therefore the size of the acute angle ∠DEC is {{}}°.

The size of ∠BEA is 70°. Therefore the size of the reflex angle ∠AEB is {{}}°.

A __________ is the region formed between two radii and their connecting arc.

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 ∠{{}}.

This lesson will soon be taken down.

Checking and securing understanding of basic angle facts

Lesson outcome