How do you do this?
I don't understand it.

what this is so weird umm try to connect b,c,and try to connect c it b again

Do you see those grid lines? Since you can't go diagonally across them, draw your line ON THEM; I would start at C and go up one, right 3, and then up one again. That connects C & A. If you want you could do A to A, which is the easiest option. Just go down straight to the A at the bottom. Hope that helps!

10 down (bang1)

5 up

5down (2)

2.5 up

2.5 down (3)

1.25 up

1.25 down (4)

now add them up : )

hoped i lol

ca = ec

cpctc makes it so that corresponding parts of the triangle you proved to be equal are equal, the other options aren't part of the part of the triangles you proved to be equal.