Question
In a parallelogram $ABCD$, determine the sum of angles $\angle\text{C}$ and $\angle\text{D}$.
✓
Answer
$\angle\text{C}$ and $\angle\text{D}$ are cosecutive interior angles on the same side of the transversal $CD$. Therefore, $\angle\text{C}+\angle\text{D}=180^\circ$
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