Question

Geometry Congruence

Answer 1

What about it? There are a LOT of things about congruence in geometry.

Answer 2

How can I prove this triangle??

Answer 3

I dont it can be proven with the info given but I'm not sure??

Answer 4

What does the angle brackets ) mean? The two angles marked are equal?

Answer 5

yes

Answer 6

all of the marks are congruence related

Answer 7

You have similar triangles: read your notes or text about similar triangles; easy

Answer 8

Thats what I mean I don't get how these can be proven by I am not sure if its SAS or something welse

Answer 9

else is what i meant to say

Answer 10

What do you know about the triangle. With some thought, it would be obvious. They are possibly more than similar, they are possibly identical. http://www.khanacademy.org/math/geometry/triangles/v/similar-triangles

Answer 11

but it has to proven like AAS, or ASA, or SAS

Answer 12

So what do you know about the sides, tell me what sides and angles you know are congruent?

Answer 13

BC congruent to AD

Answer 14

AC is congruent to CA

Answer 15

not sure about the angles??

Answer 16

You told me early that the angles are congruent?!

Answer 17

yeah but half of A isn't and half of C isn't

Answer 18

I don't know what could be used to prove the triangles congruent??

Answer 19

i keep concluding to Side Angle Side (SAS)

Answer 20

BAC is an angle in and of itself, DCA is an angle in an of itself. You are not necessarily concerned with all of A, or all of C. (A side note use the curve bracket (, the square bracket implies a right angle and I don't think that was your intent._

Answer 21

SO i guess i don't have sufficient info to prove this angle.

Answer 22

cause if their really was a postulate of theorem out their it would be SSA but thats not usable

Answer 23

You need to do what is called good bookeeping because you stated what proof you needed, and then you stated the proof. When you say, AC is congruent to CA, you need to list one side. Keep a list in the margin, you would find that you have already stated what you need.

Answer 24

but i still think their is not enough information to prove this

Answer 25

The triangles cannot be proved congruent with the given information.