Complementary angles have the sum of 90°. The measure of the complement of an 18° degree angle is 72°.
When the sum of two angles measures up to 90° then these angles are known as complementary angles of each other.
for example, ∠x + ∠y = 90°, therefore, the ∠x and ∠y are the complementary angles of each other.
We know that the sum of the complementary angle is 90°, therefore, the complement of the 18° angle can be found as,
[tex]\angle x + 18^o = 90^o\\\\\angle x = 90^o -18^o\\\\\angle x = 72^o[/tex]
Hence, the measure of the complement of an 18° degree angle is 72°.
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