if a 12 sided regular polygon rotates about its center at which angles of rotation will the image of the polygon coincide with the preimage?

Question

darkknight · Answer

Where is the preimage?

shalaya · Answer

there's no preimage...it's a question that is on y test, but there is no picture.

darkknight · Answer

There should be a preimage, otherwise how are u supposed to do it.
Is this for a test?

shalaya · Answer

Yes its for a test that is infront of  me; its getting me frustrated.

darkknight · Answer

If it is for a test I can't help you. Sorry :(
Also the problem is unsolvable without the preimage anyways

shalaya · Answer

its fine; ill figure it out.; thanks for your help anyways.

darkknight · Answer

np

shalaya · Answer

i found the answer; That is 360/12 = 30 degrees (the outside angle). If it rotated thus 12 times, it would have made one complete rotation

darkknight · Answer

Thats nice. I still don't know how this is solvable without the preimage. Maybe not posted on the test?