Opposite it is the triangle’s hypotenuse, the longest of the three sides, usually labeled c . The other two angles in a right triangle add to 90° ; they are complementary. The sides opposite the complementary angles are the triangle’s legs and are usually labeled a and b .

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## Answer

Perpendicular side and base side## Explanation

Hypotenuse and Sides of a Right Triangle

Opposite it is the triangle’s hypotenuse, the longest of the three sides, usually labeled c . The other two angles in a right triangle add to 90° ; they are complementary. The sides opposite the complementary angles are the triangle’s legs and are usually labeled a and b .