A=[i,0 0,-1], B[0,-1 1,0],C[0,i i,0] verify A²=B²=C²=-1

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

What’s the range cuz i can’t find it?

Given the diagram below, michael writes, "segment ac is congruent to segment ac." which of the following reasons allow him to write this statement?