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7 July, 17:29

The measure of an angle is 78°. What is the measure of a complementary angle?

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  1. 7 July, 17:38
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    Complementary angles add up to 90°.

    It is given that one angle is 78°.

    Let the other angle be x.

    Therefore x+78=90

    x=90-78

    x=12°
  2. 7 July, 17:46
    0
    First you need to know the definition of a complementary angle. That means that two angles add up to 90 degrees, or a right angle.

    To find an angle complementary to a 78 degree angle, you need to subtract 78 from 90.

    90 - 78 = 12
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