In a quadrilateral ABCD, ∠B = 90° and AB2 + BC2 + CD2 - AD2 = 0, then what is ∠ACD equal to?

In a quadrilateral ABCD, ∠B = 90° and AB2 + BC2 + CD2 - AD2 = 0, t

1.	In a quadrilateral ABCD, ∠B = 90° and AB2 + BC2 + CD2 - AD2 = 0, then what is ∠ACD equal to?
A.	30°
B.	60°
C.	90°
D.	120°
Answer» D. 120°

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In a quadrilateral ABCD, ∠B = 90° and AB2 + BC2 + CD2 - AD2 = 0, then what is ∠ACD equal to?

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