Can someone please help me with these?

If 1 km = 0.621 miles, how many miles are in a centimeter

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.

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180