Question

∠def measures 90°. what type of angle is it? choose 1 answer: a acute angle b obtuse angle c right angle d straight angle

Explanation:

An acute angle measures less than 90°. An obtuse angle measures more than 90° but less than 180°. A right angle measures exactly 90°. A straight angle measures 180°. Since ∠DEF measures 90°, it is a right - angle.

Answer:

C. Right angle