2 years ago

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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