Question

Siobhan rotates a right triangle 90° counterclockwise about the origin. How does the orientation of the image of the triangle compare with the orientation of the preimage?

a) It is flipped vertically
b) It is flipped horizontally
c) It remains unchanged
d) It is rotated 90° clockwise

Answer 1

The orientation of the image of the triangle after rotating it 90° counterclockwise about the origin is (b) It is flipped horizontally.

Step-by-step explanation:

The orientation of the image of the triangle after rotating it 90° counterclockwise about the origin is (b) It is flipped horizontally. The triangle will be reflected across the y-axis, resulting in a mirror image of the original triangle.