SOLUTION: Use indirect reasoning to show that there is only one right angle in a right triangle.

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Question 818571: Use indirect reasoning to show that there is only one right angle in a right triangle.
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

there is only one right angle in a right triangle because, by definition, all three angles in a triangle MUST add up to 180 degrees
if you have two right angles, their sum is already 180 degrees; so, there will be no way to have third angle in the shape and you'd never get a triangle out of that
or
having two right angles would give you two parallel lines perpendicular to a third; so, you'd never get a triangle out of that either