Angles on a Straight Line
11+ Maths, topic 1.3.1
Angles on a Straight Line
Angles on a straight line always add up to 180°. You can use this information to solve straight line problems.
Find the missing angle
Angles on a straight line add to 180°
- You know that angles on a straight line add up to 180 degrees.
- So you need to take the angle away from 180 degrees to work out the missing angle.
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Work out the answer
- 180 - 110 = 70
- So the missing angle is 70°
Test yourself on Angles on a Straight Line
What do angles on a straight line add up to?