How do I prove that a angle equals 90° in a right triangle?

1 Answer
Alan P.
Mar 5, 2018

This is basically a definition of what is meant by a right angle.

Explanation:

A right triangle is a triangle in which one of the angles is a right angle.

By definition a right angle is half of the angle represented by a straight line, where a straight line angle is defined to be #180^circ#
implying that a right angle is #90^circ#

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