# Identify and Compare Angles

Lesson

## Identifying angles

Angles are everywhere we look and they help us measure how much something turns. There are angles right beside you now. Can you see any?

Let's explore some angles in Video 1.

## Comparing angles

When we open a door, we create an angle. As we open the door further, the angle increases (gets bigger). Can you see the angle we are creating in the door opening below? What happens when we open the door further?

In Video 2, we look at how similar objects can have different angles. Let's look at how angles can be bigger, smaller or the same.

Remember!

Even if we make the arms of an angle longer, the size of the angle doesn't change.

#### Worked examples

##### Question 1

Which angle is bigger?

1. A

B

A

B

##### Question 2

In the clocks shown, think of the angle from the minute hand to the hour hand going clockwise.

Which clock shows the bigger angle?

1. A

B

A

B

##### Question 3

Think about the two angles shown below and fill in the blanks.

1. The arms in Angle $1$1 are             the arms in Angle $2$2.

the same as

A

shorter than

B

longer than

C

the same as

A

shorter than

B

longer than

C
2. The angle in Angle $1$1 is the angle in Angle $2$2.

smaller than

A

larger than

B

the same as

C

smaller than

A

larger than

B

the same as

C

### Outcomes

#### GM3-3

Classify plane shapes and prisms by their spatial features