Geometry question, involving proofs! Question down below!

Question

matlee · Answer

what http://openstudy.com/study#/updates/546012f3e4b052b0143d8f71

raveninneverland · Answer

|dw:1415582820602:dw|

raveninneverland · Answer

All done!

raveninneverland · Answer

Please help! I'm not sure where to go from here. I know AB and DE are congruent but I don't know how to prove they're congruent, like with a theorem

matlee · Answer

did you learn about cpctc

raveninneverland · Answer

Yeah, but I'm not sure I can use that whenever I haven't proved triangles are congruent yet

mertsj · Answer

Use ASA to prove triangle ACD is congruent to triangle ECB.
Then angles A and E are corresponding parts of congruent triangles.

matlee · Answer

how can he use asa if he has only two sides i ned help to :9

raveninneverland · Answer

Yeah, I can't use that. I've noticed I can use Angle C being congruent in those triangles because it overlaps but I don't have another side that's congruent

xapproachesinfinity · Answer

that's all you need angle is congruent two sides are congruent
then the triangles are congruent

matlee · Answer

So the questions is what does he need or what is the answer

xapproachesinfinity · Answer

you have ac congruent to ce
and cd congruent to cb
and angle c is shared so the triangles are congruent

raveninneverland · Answer

Oh! Okay. I see now.

xapproachesinfinity · Answer

that's two side congruency and the angle so postulate SAS is good

xapproachesinfinity · Answer

Alright good