1.

congruent means equal
2.

bisect means to cut a line segment in two equal parts
Above the AB, CD, AB, and BC there has to be a line. I could not write that because LaTeX doesn't allow it.
3.

You set both equal to each other
4.

midpoint means that both line segments are equal
Same thing goes for PA, and AT. You need to draw a line above it.
Hope that helped :)