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Solve for x: the angles of a triangle

Year 9 maths · Fieldbook Learning

Name ______________________ Date __________

The three angles add to 180°. Write an equation, combine like terms, and solve for x.

  1. The angles of a triangle are (3x − 5)°, (x + 18)° and (x + 57)°. Find x.
  2. The angles of a triangle are (x + 18)°, (3x + 5)° and (3x − 46)°. Find x.
  3. The angles of a triangle are (2x − 8)°, (3x + 13)° and (2x + 56)°. Find x.
  4. The angles of a triangle are (2x − 3)°, (x + 6)° and (2x + 32)°. Find x.
  5. The angles of a triangle are (3x − 3)°, (3x + 2)° and (x − 29)°. Find x.
  6. The angles of a triangle are (x − 10)°, (x + 9)° and (3x + 21)°. Find x.
  7. The angles of a triangle are (x − 7)°, (x + 4)° and (3x + 8)°. Find x.
  8. The angles of a triangle are (3x + 7)°, (x + 2)° and (2x + 15)°. Find x.
  9. The angles of a triangle are (3x)°, (3x + 15)° and (2x − 27)°. Find x.
  10. The angles of a triangle are (2x + 9)°, (x + 15)° and (x + 48)°. Find x.
  11. The angles of a triangle are (x + 8)°, (3x + 16)° and (x + 41)°. Find x.
  12. The angles of a triangle are (2x + 11)°, (x − 1)° and (3x − 16)°. Find x.
  13. The angles of a triangle are (x + 20)°, (3x + 17)° and (x + 28)°. Find x.
  14. The angles of a triangle are (2x − 3)°, (x + 20)° and (3x − 23)°. Find x.
  15. The angles of a triangle are (x + 18)°, (x + 8)° and (x + 49)°. Find x.
  16. The angles of a triangle are (3x + 18)°, (2x + 1)° and (2x + 28)°. Find x.
  17. The angles of a triangle are (2x + 16)°, (2x + 1)° and (x + 38)°. Find x.
  18. The angles of a triangle are (x − 4)°, (2x + 9)° and (3x − 17)°. Find x.
  19. The angles of a triangle are (x + 16)°, (2x + 1)° and (2x − 17)°. Find x.
  20. The angles of a triangle are (x + 18)°, (2x + 14)° and (x + 20)°. Find x.
More free practice: fieldbooklearning.com/uk/practice/year-9/solve-for-x-the-angles-of-a-triangle/

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Answer key: Solve for x: the angles of a triangle

  1. 22
  2. 29
  3. 17
  4. 29
  5. 30
  6. 32
  7. 35
  8. 26
  9. 24
  10. 27
  11. 23
  12. 31
  13. 23
  14. 31
  15. 35
  16. 19
  17. 25
  18. 32
  19. 36
  20. 32