Measuring angles

When measuring angles, make sure that the centre of the protractor is over the vertex (corner) of the angle and that the base line of the protractor is along one of the lines of the angle.

Protractor diagram
Question

Use the protractor to measure the following angle:

Protractor diagram

40 ^\circ

Question

Use the protractor to measure the following angle:

Protractor diagram

70 ^\circ

Question

Use the protractor to measure the following angle:

Protractor diagram

{135}^\circ

Question

Use the protractor to measure the following reflex angle:

Protractor diagram

The reflex angle is:

{360}^\circ - {120}^\circ = {240}^\circ