Yes.
Make one triangle using hree matches.
Underneath the two vertices at the base of this triangle, make another two triangles, using six more matches.
You will find that there is an inverted triangle in the middle - the fourth.
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You can't use AAA to prove two triangles congruent because triangles can have the same measures of all its angles but be bigger or smaller, AAA could probably be used to prove two triangles are similar not congruent.
Excuse me, but two triangles that have A-A-S of one equal respectively to A-A-S of the other are not necessarily congruent. I would love to see that proof!
marks used on a figure to indicate congruent
its the therom that states that a2+b2=c2 :). it is used for triangles. i dont know about other shapes. but is for triangles
congruent