Geometry and measuresKS3 / GCSE

Angles on a straight line

Find missing angles using a total of 180°.

  • Angles on a straight line add to .
  • Add any known angles before subtracting from .

Example 1

Find angle .

Angles on a straight line add to 180°.

Example 2

Find angle .

Add the known angles, then subtract from 180°.

Your turn

Question 1

Find angle .

Check answer
Angles on a straight line add to 180°.
Question 2

Find angle .

Check answer
Add the known angles, then subtract from 180°.
Question 3

Find angle .

Check answer
Angles on a straight line add to 180°.
Question 4

Find angle .

Check answer
Add the known angles, then subtract from 180°.
Question 5

Find angle .

Check answer
Angles on a straight line add to 180°.
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