Mathematics

Adriel Hatfield

29 September, 15:54

Let's say you opened your laptop and positioned the

screen so it's exactly at 90° - a right angle - from your

keyboard. Now, let's say you could take the screen and

push it all the way down beyond 90°, until the back of the

screen is flat against your desk. It looks as if the angle

disappeared but hasn't. What is the angle called, and

what is the measurement?

A. Straight angle at 180°

B. Linear angle at 90°

C. Collinear angle at 120°

D. Horizontal angle at 180°