Finding angles on a straight line
A straight angle or an angle on a straight line is exactly 180°.
Angles that add together to make a straight line are called supplementary angles.
If you know one supplementary angle you can subtract it from 180° to find a missing angle.
Question
What is the size of angle p?
The angles on a straight line add up to 180°.
p = 180° - 140°
p = 40°
