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OpenStudy (anonymous):
Quadrilateral ABCD with vertices A(4, 3), B(4, -2), C(-4, -2) and D(-4, 3) is a rectangle, find the length of the diagonals.
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OpenStudy (anonymous):
AB has length 5 AD has length 8 BD (diagonal) by Pythagorean Theorem has length \[\sqrt{8^{2}+5^{2}}=\sqrt{64+25}=\sqrt{89}\]
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