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Adjacent angles of a parallelogram are _____.

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A rectangle whose adjacent sides are equal becomes a ________.

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If one diagonal of a rectangle is 6cm long, length of the other diagonal is _______.

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If only one diagonal of a quadrilateral bisects the other, then the quadrilateral is known as _______.

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The trapezium ABCD with ABCD, if ∠A = 100⁰, then ∠D =