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Geometry · Grades 7 to 8

Complementary and supplementary angles worksheet generator

Make complementary and supplementary angles worksheets with a diagram for every problem. Students find the missing angle x, using 90° or 180°.

Complementary and supplementary anglesLetter 8.5 × 11 in · answer key on the last page
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In the print window choose Letter and 100% scale, or Save as PDF.

Complementary and supplementary angles
NameDate

Find the value of x. Complementary angles add up to 90°; supplementary angles add up to 180°.

  1. 1.
    42°x
    x =
  2. 2.
    99°x
    x =
  3. 3.
    75°x
    x =
  4. 4.
    114°x
    x =
  5. 5.
    44°x
    x =
  6. 6.
    72°x
    x =
  7. 7.
    53°x
    x =
  8. 8.
    91°x
    x =
  9. 9.
    20°x
    x =
nation1.netSheet 103420690
Complementary and supplementary angles
Answer key
  1. 1.90 − 4248°
  2. 2.180 − 9981°
  3. 3.90 − 7515°
  4. 4.180 − 11466°
  5. 5.90 − 4446°
  6. 6.180 − 72108°
  7. 7.90 − 5337°
  8. 8.180 − 9189°
  9. 9.90 − 2070°
nation1.netSheet 103420690 · answers
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About this worksheet

Complementary angles add up to 90° (a right angle, marked with a small square); supplementary angles add up to 180° (a straight line). The diagram tells you which total to use.

Teaching tip

A memory aid that works: C comes before S, and 90 comes before 180.

How to use the generator

Change the settings and the sheet updates as you go. New worksheet gives a fresh set of problems with a new answer key. Print or save PDF opens your browser's print window: pick Letter paper and 100% scale, or Save as PDF to keep a copy.