How do we prove triangle congruent

To prove that triangles are congruent is every easy in many math problems we are always give one or two congruent angles or one or two congruent sides.

 Like the two on the top.

 with the marking that are given to use its easier to prove that they are congruent. 

we can use:

• SSS (Side Side Side)
• SAS (Side Angel Side)
• ASA (Angel Side Angel)
• AAS (Angel Angel Side)

Reason why SSS,SAS,ASA,AAS< and HL work 

Say we are given

we will need a T-Chart like this one

As you can see line AC≌EC and BC≌DC are both given <ACB≌<EDC is also given but we need to prove it by saying something that will prove it like they are Vertical Angels.Using Side Angel Side we figured out that the two triangles are congruent.

for more help or work check out these links:

• http://www.youtube.com/watch?v=NAhcmPS5k9g
• http://mathteachermambo.blogspot.com/2010/11/proving-triangles-congruent.html
• http://www.wyzant.com/Help/Math/Geometry/Triangles/Congruent_SSS_SAS.aspx
• http://www.youtube.com/watch?v=_O5qrryg4Ps