You can see it's an acute angle, so it's less than 90°. Image caption, Find the base line on the protractor (it's marked 0° at one end and 180° at the other end). ... Show answer Hide answer ...

Comedian Demetri Martin is known for incorporating drawings into his stand-up specials. With his first solo exhibition of paintings and drawings, he hopes to make you laugh without any words at all.

Angles are a measure of turn and are measured in degrees. Discover more with a video and activity in this Year 5 BBC Bitesize Maths article.