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When the sum of two angles measures up to 90° then these angles are known as complementary angles of each other. The correct option is C.

What are Complementary Angle?

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.

The two angles which are complementary angles are  1° and 89° because their sum is 90°.

Hence, the correct option is C.

Learn more about Complementary Angles:

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