SOLUTION: How can you figure out if the diagonal oof a shape is perpendicular?

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Question 940904: How can you figure out if the diagonal oof a shape is perpendicular?
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

perpendicular diagonals form 4 right angles (90 degrees angles) at the point where they meet, and it's easy to check if angle is 90 degrees
several quadrilaterals have perpendicular diagonals, including:
square
kite
rhombus
parallelogram