Question

Triangles DEF and D'E'F' are shown on the coordinate plane below:

D
E
F
2 3 4 5 6 7 8
-8-7-6-5-4-3-2-1
F
E2
D'
What rotation was applied to triangle DEF to create triangle D'E'F'?
90° clockwise
180°
None of the above
90° counterclockwise

Answer 1

180

Explanation:

My geometry teacher always said to think of it like an office chair. If you turn 90 degrees to your right, your left shoulder will be close to the computer. That is turning clockwise. to the left . is counterclockwise. If you turn 180 degrees you are facing away from the pc. Turning 190 degrees either way will get you to the same spot. You can see here the triangles are looking opposite ways. I also reconize you are on FLVS lol. Have fun with the rest of the course and CHECK YOUR EMAIL BOX!!!!!!

Answer 2

180° rotation

Explanation:

(x , y) --> (-x , -y)

The D' coordinate has mistake on the graph, it should be (-1 , -7) instead of (-1 , -6)