two-column proofs

A proof is finished when...

• the last reason matches what you are trying to prove

• the last statement matches what you are trying to prove

• your brain says your finished

• you get tired

What is always the 1st statement in reason column of a proof?

• Prove
• Given
• Reason
• Statement

What is reason 2?

• Addition Property of Equality
• Subtraction Property of Equality
• Multiplication Property of Equality
• Division Property of Equality

Tags

CCSS.HSA.REI.A.1

CCSS.HSA.REI.B.3

What is reason 1?

• Subtraction Property of Equality

• Transitive Property of Equality

• Given

• Division Property of Equality

Tags

CCSS.HSA.REI.A.1

What is reason 3?

• Addition Property of Equality
• Subtraction Property of Equality
• Multiplication Property of Equality
• Division Property of Equality

Tags

CCSS.HSA.REI.A.1

CCSS.HSA.REI.B.3

How many columns are in a two-column proof?

• depends on the proof

• 5

• as many as you want

• 2

What is the heading of the LEFT column in a two-column proof?

• statements

• reasons

• stuff that is true

• solutinos

What is the heading of the RIGHT column in a two-column proof?

• Statements

• Reasons

• stuff that is true

• Results

What style of proofs have we been working on?

• flow chart proofs

• paragraph proofs

• two-column proofs

• we've never worked on proofs... ever

The first reason in a two column proof is almost always...

• because my teacher said so

• given

• information

• The Pythagorean Theorem