Angle x measures 42°. Find the measure of angle y.
Responses
A 42°42°
B 48°48°
C 138°138°
D 148°148°
E 180°
The sum of the measures of the angles in a triangle is always 180 degrees. Since angle x measures 42 degrees, the sum of angle x and angle y is 180 degrees. Therefore, angle y measures 180 - 42 = 138 degrees.
The measure of angle y is 138 degrees, so the correct answer is C) 138°.