Pupil Zone Maths

Missing angles (triangles and straight lines) worksheets for Year 6

Angles in a triangle add to 180°, and so do angles on a straight line.

  • Year 6, ages 10–11 (UK)
  • Topic: Shapes and geometry
  • Easy, medium and hard levels, with fresh questions every time
  • Printable PDF with an answer key, or practise online with instant marking
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Sample questions

Year 6, medium level. Your worksheet will have new questions.

1.Two angles on a straight line are 65° and °. Find the missing angle. °
2.Two angles of a triangle are 65° and 30°. What is the third angle?
Answer °
3.Two angles on a straight line are 40° and °. Find the missing angle. °
4.Two angles on a straight line are 145° and °. Find the missing angle. °
5.Two angles on a straight line are 80° and °. Find the missing angle. °
6.Two angles on a straight line are 160° and °. Find the missing angle. °
7.Two angles on a straight line are 45° and °. Find the missing angle. °
8.Two angles of a triangle are 40° and 120°. What is the third angle?
Answer °