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Proof by contradiction

Proof by contradiction

Author: Jonathan Heeren
Description:

9.3.2.4 Construct logical arguments and write proofs of theorems and other results in geometry, including proofs by contradiction. Express proofs in a form that clearly justifies the reasoning, such as two-column proofs, paragraph proofs, flow charts or illustrations. 

a) I can construct logical arguments.

b) I can write proofs of theorems.

c) I can write proofs of contradiction.

d) I can use multiple forms to express a proof that

    clearly justifies reasoning.

(more)
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Tutorial

Notes on Indirect Proof

Please copy down these notes into your notebooks.

introduction to indirect proof

This is a basic definition and some examples of indirect proof.

A video explaining how indirect proof works.

Indirect Proofs

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indirect proof and reasoning

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Worksheet on Indirect Proofs

Can you take an indirect proof from start to finish?

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