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PROOFS ? - PowerPoint PPT Presentation

PROOFS . I will successfully write a two-column proof!!!!. Statements / Steps. Justification / Reasons. Always start with the Given. The justification will be a: Theorem Postulate Definition Property. Your last statement will always be what you are “proving.”.

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PROOFS 

I will successfully write a two-column proof!!!!

Justification / Reasons

• The justification will be a:

• Theorem

• Postulate

• Definition

• Property

Your last statement will always be what you are “proving.”

Congruency

• When referring to the actual structure (i.e. ABC & FG)

• Whenever you use Properties of Congruency

Equality

• When using measure/lengths (i.e. m ABC & FG)

• Whenever you need NUMBERS

• If you add, subtract, multiply, divide

• Whenever you use Properties of Equality

Statements

Justifications

• O is the midpoint of MN

• OM = OW

1. Given

2.

2. Def. of Midpoint

3. NO = OM

3. Def. of Congruent

4. NO = OW

• Transitive P. of E. or Substitution P. of E.

• (Steps 1 & 3)

• Proofs Worksheet #2 (3 and 4)