Question

Which of the following is not a valid postulate or theorem for proving triangles congruent?

A.
SSA
B.
ASA
C.
AAS
D.
SAS

Answer 1

now, in order to prove, in the practice when a postulate does not apply, you just try out to see i you can construct a triangle differently following the rules.

For instance, let's take a look at SAS.
This implies that we have two congruent sides, with a fixed length and the angle between them a fixed value as well.

Now, there is only one way I can create a triangle given two sides and the angle in between, and that is by joining the segments, there is no other way, so therefore, SAS is a valid congruence postulate.

Answer 2

Its not sas its SSS

Answer 3

it is not SSS.
SSS is the most straight forward congruence postulate, and derives from the idea that if all the sides are congruent, then the triangle is congruent.
You can only build one triangle given three sides.

Answer 4

:_:

Answer 5

Listen to the "Mathllete"