The interior angles formed by the sides of a quadrilateral have measures that sum to 360°.

What is the value of x?

Enter your answer in the box.

x = ?

A polygon with hash marks on the two sides, the left side labeled four X plus twelve and the right side labeled sixty but here's the picture.

The interior angles formed by the sides of a quadrilateral have measures that sum to 360 What is the value of x Enter your answer in the box x A polygon with ha class=