Question

Complete a two column proof for this problem

Answer 1

You have AAA and one side. You can do the proof. Start with alternate interior angles..

Answer 2

i don't know how to do it :/

Answer 3

Well, here is a sketch..
you are given angle B = angle D
Since AD is parallel to CD, angle A = angle C
So you have two angles and the third must also be equal, so you have at least similar triangles.
Now, you are given BF = ED
Notice that angle B = angle D and angle F = angle E
Now you have ASA

Answer 4

i don't get anything :S

Answer 5

You understand that angle B = angle D, and why?

Answer 6

i don't get why :S

Answer 7

It's given. It's in the problem statement.

Answer 8

ok

Answer 9

It's also given that AB is parallel to CD.
Sorry, I had a typo before, maybe that confuse you.

Answer 10

its ok

Answer 11

The two slash lines means parallel.

Answer 12

i know that

Answer 13

Now, do you know a theorem that explains why the green angles are equal in this picture?

Answer 14

omg, this is woo much i think I'm giving up...