THE CORRECT ANSWER IS (A). THE NUMBER OF DEGREES IN THE THREE INTE...

27. The correct answer is (A). The number of degrees in the three interior angles of a

triangle add up to 180. Thus, you can calculate the third, unmarked angle in the

upper-left triangle: It must measure 110°. Since the vertical angles are congruent, the

“top” angle in the bottom triangle must also measure 110°. Since 110°

1

45°

5

155°,

there are just 25° left for x—the third angle of the triangle.