Two angles of a triangle measure 42° and 84°. find the measure of the third angle, in degrees. (enter an exact number.)

Let the third angle be x.

Sum of the interior angles of a triangle = 180°

42 + 84 + x = 180

126 + x = 180

x = 180 - 126

x = 54°

Hence, the third angle is 54°.

Ithink not so sure but i tried it out and came out to be b