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Before using Corresponding Parts of a Congruent Triangle are Congruent theorem (CPCTC) in a geometric proof, you must first prove that there is a congruent triangles. This method can be used for proving polygons and geometrical triangles.
Theorems is what is proven with the geometric proof.
True
The term that best describes a proof in which you assume the opposite of what you want to prove is 'indirect proof'.
consists of a logical chain of steps supported by accepted truths.. Plato ;)