Question

1. choose the best answer.

images of angles labeled a, b, c, d
which angle has a measure of exactly 90 degrees?
options:
○ c
○ b
○ d
○ a

Explanation:

An angle of exactly 90 degrees is a right angle, which is represented by a small square at the vertex (as in option C). Option A is an acute angle (less than 90°), option B is an obtuse angle (greater than 90° but less than 180°), and option D is a straight angle (180°). So the angle with exactly 90 degrees is option C.

Answer:

C. The angle with the right - angle symbol (small square at the vertex)