Angle sum theory

A) 10

B) 17

C) 3

D) 12

The tile along the edge of a triangular community pool needs to be replaced? ?

Proportions in triangles solve for x

If a distance of 75 yds is measured back from the edge of the canyon and two angles are measured , find the distance across the canyon angle acb = 50° angle abc=100° a=75 yds what does c equal?