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37 votes
37 votes
If ZN and ZM are congruent and supplementary, then ZN and ZM are right angles.

User Pogo Lin
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1 Answer

14 votes
14 votes

Supplementary angles add up to 180 degrees. If they are congruent and supplementary, that means they have the same measure and also add up to 180:

2x=180

x=90

90 degrees angles are also called RIGHT ANGLES.

User Ravindra Bagale
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