Question

Triangle ABC is rotated counterclockwise using the origin as the center of rotation. The preimage and image are shown in the graph below.

Which rotation could have taken place?
a 90° rotation
a 135° rotation
a 225° rotation
a 315° rotation

Answer 1

the answer is a 225 degrees

Answer 2

a 225° rotation

Explanation:

Triangle ABC is rotated counterclockwise using the origin as the center of rotation.

The rotation that took place is 225 degrees.

The points A' and C' are tilted more than 180 degrees from the origin of rotation. If it were 90 degrees, the A' and C' would have been in the right side. So, the answer is 225 degrees.