Question

Is it we can't prove it because we need to see a triangle right?

Answer 1

here is the ?

Answer 2

It's not so much that you need to see the triangle, it's that you need to know at least three parts of one triangle are congruent with three parts of the other triangle. Since all you know is one side of one triangle is congruent to one side in the other, that's not nearly enough to know if the triangles are congruent.

Answer 3

So is there any way I can prove it? since I know?

Answer 4

or wait. I can't prove it.

Answer 5

Right; you can't prove it because you know AE is congruent to CD, but you need to know two other things are congruent as well. They don't give you enough info.

(Note: You can't just have ANY three congruent statements. If you know three angles in one triangle are congruent to three angles in another, that's not enough information (AAA). Also, if you know two sides are congruent and the angle not between the sides are congruent (SSA), that's also not enough information...)

Answer 6

Thank you so much!