Indirect Proof Worksheet. A keyword signalling that you should consider indirect proof is the word 'not'. The idea behind the indirect method is that if what you assumed creates a contradiction, the.
A theorem is a proposition that can be proved using de nitions, axioms, Use the Exterior Angle Theorem and the Linear Pair Theorem to write the indirect proof. The idea behind the indirect method is that if what you assumed creates a contradiction, the.
Use the worksheet/quiz combo to check your knowledge of direct and indirect proofs.
To do this, you must assume the negation of the statement to be proved.
A rule of inference is a logical rule that is used to deduce one statement from others. Mathematical proofs are often written in a formal style, but that is not required. Students do much better with indirect proofs when seeing the same proof done directly right next to it.