Question
Opposite angles of a quadrilateral $ABCD$ are equal. If $AB = 4\ cm$, determine $CD.$
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Answer
Given, opposite angles of a quadrilateral are equal. So, $ABCD$ is a parallelogram and we know that, in a parallelogram opposite sides are also equal. $∴\text{CD}=\text{AB}=4\text{cm}$
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