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Year 8 maths · S.1 · Angles and triangles

Complementary angles

Complementary angles add up to 90 degrees.

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  1. Two angles are complementary. One angle is 39°. How many degrees is the other angle?

    Answer: 51

  2. Two angles are complementary. One angle is 72°. How many degrees is the other angle?

    Answer: 18

  3. Two angles are complementary. One angle is 54°. How many degrees is the other angle?

    Answer: 36

Tip: Complementary angles add up to 90 degrees.

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