Home > Maths > Shape and space > Angles
There are 360° in a complete turn.
There are 180° in half a turn (a straight line).
Find the size of angle z:
There are 360° in a complete turn, so z + 40 + 110 + 130 = 360
z + 280 = 360
z = 80°
What is the size of angle p?
The angles on a straight line add up to 180°, so p + 140 = 180.
p = 40°
The angles in a triangle add up to 180°
The angles in a quadrilateral add up to 360°.
This works for any quadrilateral. Again, you can try this for yourself with a piece of paper!
BBC © 2014 The BBC is not responsible for the content of external sites. Read more.
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.