Question

Three angles in a quadrilateral are 65, 80, and 100. Which of the following could be the 4th angle?

A80
B115
C180
D360

Answer 1

All the angles of the quadrilateral have to sum up to 360

So 65 + 80 + 100 = 245 and then 360 - 245 = 115

So its B. 115