Question

prove that in a right triangle , the square on the hypotenuse is equal to the sum of the squares on the other two sides

Answer 1

Take a right angles triangle
Extend the base of the triangle away from hypotenuse equal to the length of the base..
From linear equation Sum of angle of base and the extended side will be 180°
And sum of all angles of a triangle is 180° too
Sides opposite to equal angles are equal.
with this you can get to that

Answer 2

Hey mate ..!
See the attachment..!
Hope it helps..!

Cheers ☺✌