In a parallelogram ABCD, determine the sum of angles ∠C and ∠D.
Question:

In a parallelogram ABCD, determine the sum of angles ∠C and ∠D.

 

Solution:

∠C and ∠D are consecutive interior angles on the same side of the transversal CD.

∴ ∠C + ∠D = 180°

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