Question

A quadrilateral has two right angles. The measure of the third angle is 99°. What is the measure of the fourth angle?

Answer 1

The measure of the fourth angle is 81°

Explanation:

we know that

The sum of the internal angles of a quadrilateral must be equal to 360 degrees

Let

x----> the measure of the fourth angle

we have

90°+90°+99°+x=360°

Solve for x

279°+x=360°

x=360°-279°=81°