Triangles def and d'e'f' are shown on the coordinate plane below:
d1
2 +e
se 1+
-8-7
75-4-3-2-1 1 1 2
3 4
5 6
7
8
d
what rotation was applied to triangle def to create triangle d'e'f'?
c 90° counterclockwise
90° clockwise
none of the above
180°