Which of the following equations can be used to solve for the radius

Find the missing factor in exponential form 48^2=3^2 • ?

Find the value of tan theta if sin theta = 12/13 and theta is in quadrant 2

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.