Lesson 2.2 Analyze Conditional Statements Goal: The learner will write definitions as conditional statements.

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Lesson 2.2 Analyze Conditional Statements Goal: The learner will write definitions as conditional statements.

Vocabulary Conditional Statement: a logical statement that has a hypothesis and a conclusion. If-then form: format for a conditional statement. Hypothesis: the “if” part Conclusion: the “then” part Hypothesis must always be true.

Example If it is raining, then there are clouds in the sky. If the car is a Mustang, then it is a Ford.

Writing Conditional Statements All birds have feathers. Two angles are supplementary if they are a linear pair.

More Examples All 90° angles are right angles. When n = 9, n² = 81. Tourists at the Alamo are in Texas.

Negation: the opposite of the original statement. The ball is red. Negation: The cat is not black. Negation:

Converse: flip-flop the hypothesis and conclusion. If it is raining, then I will carry an umbrella. Converse If I am in Roadtown, then I’m in Tortola. Converse

Inverse: Negate both the hypothesis and conclusion If it is a Corvette, then it is a Chevy. Inverse: If you are a soccer player, then you are an athlete. Inverse:

Contrapositive: negate and flip-flop the hypothesis and conclusion. Converse: Inverse: Contrapositive: Are these statements true?

Verifying Statements You must show the conclusion is true every time the hypothesis is true. It only takes one counterexample to show it’s false.

Use “Guitar players are musicians.” to write the following. “If-then” Converse Inverse Contrapositive Which statements are true? Give a counterexample if it is false.

If a polygon is equilateral, then the polygon is regular. Converse Inverse Contrapositive

Equivalent Statements: when two statements are both true or false. Conditional Statement and its contrapositive are either both true or false. Converse and inverse are either both true or false.

Definitions as Conditional Statments Any definition can be written as “if- then” or as its converse. Example: Right Angles: If the angle measure is 90◦, then it is a right angle.

Biconditional Statement: When a “If-Then” and its converse are true you can write them as a single statement. All definitions are biconditional. Example: Perpendicular lines: If the angle measure is 90◦, then then it is a right angle. Converse: If the angle is a right angle, then the its measure is 90◦. Biconditional: An angle is a right angle if and only if the its measure is 90◦

Example Write the definition of straight angle as a biconditional statement.

Another Example If Mary is in theater class, she will be in the fall play. If Mary is in the fall play, she must be taking theater class.