(a) Using only a straightedge and a compass, find the image of point M after a reflection in line t. Label it as M ' .

(b) Give an explanation for why point M, N and M ' must be
collinear.

(c) PMM ' must be isosceles (see problem 2(c)). Angles M and M ' are called the base angles of the
triangles. What must be true about these angles? Use facts about rigid motions to justify your answer.