Page 130 - Math Smart - 7

Extend one of the arms by drawing a straight line.
This line divides the angle into two parts.

The green part of the angle is 180° (straight line).
Use your protractor to measure the orange part
of the angle. It is 75°.

So, the reflex angle is 180° + 75° = 255°.

Check My
Understanding is:

Q Complete the sentences. Then match each clock to the correct sentence.

• This is a 180-degree angle and is a

angle.

This is a full circle (360°) and is a

turn.

This is a right angle (90°) and is a
angle.

This is a 270-degree angle and is an
angle.

Angles and Their Properties