Question

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Write an indirect proof proving the two non-right angles of a right triangle measure less than 90°.

Answer 1

sum of all angles is 180

a+b+c= 180

and one of the angle let say c is 90

then a+b+90 = 180

which gives a+b = 90

a>0 and b>0 and there is addition is 90 .. what does that mean .. that means both are less than 90

Answer 2

oh okay, I think I'm getting it. But would that be an indirect proof?

Answer 3

ok let proof indirectly

Answer 4

see in right angle triangle. one angle is 90. if another angle is also bigger than 90 then sum will become more than 180 .. which is not possible

Answer 5

did you understand

Answer 6

Okay Ive got that part

Answer 7

So in the proof above, A and B are both less than 90?