An n-sided polygon rotates 360° about its center, P. The image coincides with its preimage n times during the rotation. What can you conclude about this polygon?

You have been tasked with sorting the rock samples shown into three categories, with two rocks in each category. what attribute would you use to sort these rocks? which rocks would be in each category? rocks: obsidian, coquina limestone, granite, soapstone,pumice, and gneiss.