Answer:
D. 42 degrees
Step-by-step explanation:
One angle is a right angle, so its measure is 90 degrees.
An exterior angle measures 132 degrees. That exterior angle is supplementary to one of the interior angles of the triangle.
180 deg - 132 deg = 48 deg
The interior angle adjacent to the 132-deg exterior angle measures 48 deg.
The measures of the interior angles of a triangle add to 180 deg.
90 + 48 + ? = 180
138 + ? = 180
? = 180 - 138
? = 42
Answer: 42 degrees
