Question

What is the measure of the missing angle?



81°
84°
87°
90°

Answer 1

In a quadrilateral, all 4 of the angles must add up to 360. 
360 - 107 - 72 - 91 = x
253 - 72 - 91 = x
181-91 = x
90

Answer 2

Answer:

Step-by-step explanation:

360-107-72-91=x

253-72-91=x

181-91=x

your answer is 90