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Brilliant_brown [7]
2 years ago
15

A

Mathematics
1 answer:
REY [17]2 years ago
7 0

Answer: C

Step-by-step explanation:

Angles in a quadrilateral add to 360 degrees, so:

90^{\circ}+90^{\circ}+99^{\circ}+m\angle C=360^{\circ}\\\\m\angle C=81^{\circ}

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