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Questions  >>  Olympiad-Math  >>  Class 9
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Q)

In a quadrilateral ABCD,$\angle B=90^{\large\circ}$ and $AD^2=AB^2+BC^2+CD^2$,then $\angle ACD=$______

$\begin{array}{1 1}60^{\large\circ}\\90^{\large\circ}\\45^{\large\circ}\\\text{None of these}\end{array} $

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