Question

Triangles DEF and D’E’F’ are shown on the coordinate plane below.



What rotation was applied to triangle DEF to create triangle D’E’F’?
Answer
90° clockwise
90° counterclockwise
180°
none of the above

Answer 1

draw the triangle on a piece of paper and rotate it
assuming you know degrees its a nice way to get some intuition into spacial things like that

Answer 2

D’E’F’ is the symmetry of DEF with respect to the origin

so it is 180° rotation