Chapter 12.1, Problem 4MC

For the figure below, answer the following.

a. If $\angle 1\cong \angle 2$, name two congruent segments.

b. If $\overline{AC}\cong \overline{BC}$, name two congruent angles besides $\angle 1$ and $\angle 2$.

c. If $\Delta ACB$ and $\Delta DCE$ are both isosceles, are $\Delta ACB$ and $\Delta DCE$ necessarily congruent? Why?

d. If $\Delta ACB$ and $\Delta DCE$ are both isosceles, are $\Delta ACD$ and $\Delta BCE$ congruent? why?