What's the answer for 4+5i and 3+i

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.

If you prove that ∆wxz is congruent to ∆yzx, which general statement best describes what you have proved?

Which equation can be solved to find x the measure of jk in the apex