Question

Triangle RST and its image, triangle R’S’T’, are graphed on the coordinate grid below.

Which rotation, using the origin as the center of rotation, transformed RST to R’S’T’?
A. a 90° clockwise rotation
B. a 90° counterclockwise rotation
C. a 45° clockwise rotation
D. a 45° counterclockwise rotation

Answer 1

B. a 90º counterclockwise rotation

Explanation:

You can tell that it moves 90º and it moves in a counterclockwise direction because from RST to R’S’T’ it moves left to right. That is counterclockwise when you look it up.

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