In a quadrilateral ABCD, B = 90 and AD2 = AB2 + BC2 + CD2, then ACD – McqOptions

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1.	In a quadrilateral ABCD, B = 90 and AD² = AB² + BC² + CD², then ACD is equal to:
A.	90
B.	60
C.	30
D.	20
E.	None of these
Answer» B. 60

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