Conditional Statements
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Conditional Statements

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This is a lesson created for a geometry class introducing conditional statements, negations, and the converse.

This is a lesson created for a geometry class introducing conditional statements, negations, and the converse.

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  • 1. Conditional Statements
  • 2. Warm Up
    • Name a linear pair.
    • Name a pair of vertical angles.
    • Find the value of each variable.
    • Which popular game
    • show host is this?
    1 2 3 4 5 104° (12x + 20)° 9y - 5°
  • 3. If-Then
    • If today is Wednesday, then tomorrow is _________________.
    • If ____________________________, then today is Sunday.
    • If I make a bad grade in this class, then _____________________.
    • If __________________________, then Egyptian will have an awesome basketball team.
  • 4. If-Then
    • If-Then statements have two parts: if and then
    • The ___________ is called the hypothesis . It’s what “might” happen.
    • The ___________ is called the conclusion . It’s what will happen if the hypothesis comes true.
  • 5. If-Then
    • IF
    • THEN
  • 6. Rewrite
    • Rewrite the statement as an if-then statement.
    • I'm a beast when you turn me on
    • I’ve been roaming around, always looking down, at all I see
    • She wears high heels, I wear sneakers
    • I make it snow, I make it flurry
    • Sometimes love comes around and it knocks you down
  • 7. Negation
    • ne·ga·tion - n.
    • A denial, contradiction, or negative statement.
    • The opposite or absence of something regarded as actual, positive, or affirmative.
  • 8. Negation
    • Write the negation of the following statements.
    • Lil Wayne is ugly.  _________________________
    • Bill Gates is poor.  _________________________
    • Tamms is a big town.  ______________________
    • Skateboarding is easy.  _____________________
  • 9. FLIPPIN COOL
  • 10. Converse
    • The converse of an if-then statement means to flip the if and then pieces.
    • Statement: If the math test is easy, then I will get a good grade.
    • Converse : If ___________________________,
    • then _________________________________.
  • 11. Converse
    • Write the converse of each statement.
    • If you live in Olive Branch, then you live in Illinois.
    • If you are 16, then you have a driver’s license.
    • If you have Mrs. Sitton, then you are taking an English class.
    • If you are a girl, then you like pink.
  • 12. Laws of Logic
    • Law of Detachment
    • If the hypothesis is true, then the conclusion is true.
    • Example
    • If you wash the Ed Hardy shirt in hot water, it will shrink.
    • You washed the Ed Hardy shirt in hot water.
    • What can you conclude?
  • 13. Laws of Logic
    • Law of Syllogism
    • If p, then q. If q, then r.  If these two are true,
    • If p, then r.  Then this must be true.
    • Example
    • If Cory falls asleep in class, he will not do the homework.
    • If he doesn’t do the homework, his grade will be bad.
    • If Cory falls asleep in class, then ____________________