Given a quadrilateral $ABCD$ with $AB=AD=10$ and $BC=CD=5$, which of the following can be a value of the angle $\angle BAD$?
(A) 45
(B)60
(C) 75
(D) 90
(E)122.5
Given a quadrilateral $ABCD$ with $AB=AD=10$ and $BC=CD=5$, which of the following can be a value of the angle $\angle BAD$?
(A) 45
(B)60
(C) 75
(D) 90
(E)122.5
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An illustration why we don't have a fixed value for $\angle BAD$