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Quadrilateral ABCD has AD = BC, ∠A + ∠B = 90°, AB = 20, CD = 10, as shown below.What is the area of ABCD?

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Quadrilateral ABCD has AD = BC, ∠A + ∠B = 90°, AB = 20, CD = 10, as shown below.

enter image description here

What is the area of ABCD?

posted Sep 9 by Sidharth Malhotra

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