Pupil Zone Maths

Missing angles (triangles and straight lines) worksheets for Grade 5

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

  • Grade 5, ages 10–11 (USA)
  • 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

Grade 5, medium level. Your worksheet will have new questions.

1.Two angles of a triangle are 115° and 30°. What is the third angle?
Answer °
2.Two angles on a straight line are 55° and °. Find the missing angle. °
3.Two angles on a straight line are 20° and °. Find the missing angle. °
4.Two angles of a triangle are 45° and 25°. What is the third angle?
Answer °
5.Two angles of a triangle are 60° and 40°. What is the third angle?
Answer °
6.Two angles of a triangle are 60° and 90°. What is the third angle?
Answer °
7.Two angles of a triangle are 55° and 70°. What is the third angle?
Answer °
8.Two angles on a straight line are 80° and °. Find the missing angle. °