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The term that best describes a proof in which you assume the opposite of what you want to prove is 'indirect proof'.
proof by contradiction
if EB=EC and AB=DC prove <A=<D
What have we got to prove? Whether we have to prove a triangle as an Isoseles triangle or prove a property of an isoseles triangle. Hey, do u go to ALHS, i had that same problem on my test today. Greenehornet15@yahoo.com
prove the intersction for crisp set theory