What value of x makes the equation true? x+10=28

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

With alll of except for the 2 that i did already

The length of an intercepted arc of a central angle of a circle is 4 cm. if the radius of the circle is 5 cm what is the measurement of the central angle to the nearest whole degree