Use the inverse trigonometric keys on a calculator to find the measure of angle a

The graph represents the gallons of water in a water tank with respect to the number of hours since it was completely filled

Which is a true statement about an exterior angle of a triangle a. it is formed by two segments that are not sides of the triangle, b. it forms a linear pair with one of the interior angles of the triangle, c. it is complementary to one of the interior angles of the triangle. d. it is formed by two segments that are sides of the triangle.

Based on the figures as marked, /\rqs = —