3. In a parallelogram ABCD, determine the
sum of angles ZC and ZD.
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Here. ABCD is a parallelogram.
The, AD∥BC and DC is a transversal.
Sum of the interior angles on the same side of the transversal is 180°.
∴ ∠C+∠D=180°
Thus, the sum of any two adjacent angles of a parallelogram is 180°
⇒ The sum of ∠C and ∠D is 180°.
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