1. Ch. 2.2 Definitions & Biconditional Statements HMWK: p. 82, #s 13 – 33 all Game Plan: Today I will be able to recognize perpendicular lines and biconditional statements. Warm-up: Write the converse of each statement. 1.If M is the midpoint of AB, then AM=MB. 2.You score a goal if the ball crosses the goal line.

2. Ch. 2.2 Definitions & Biconditional Statements Biconditional Statements When a conditional statement & it’s converse are both true. “if and only if” form Can be rewritten into a conditional statement and the converse

3. Ch. 2.2 Definitions & Biconditional Statements You may go to the movies Friday night if and only if you clean your room. 1.Is it a biconditional statement? Example 2.Write as a conditional statement & the converse. Conditional Statement: If you want to go to the movies on Friday, then you have to clean your room. Converse: If you clean your room, then you may go to the movies on Friday.

4. Ch. 2.2 Definitions & Biconditional Statements Perpendicular Lines Perpendicular (  ): two lines that intersect to form a right . –  to a line –  to a plane

5. Ch. 2.2 Definitions & Biconditional StatementsNotation

6. Ch. 2.2 Definitions & Biconditional StatementsWrap-up 1.Write a biconditional statement. 2.Rewrite the statement into a conditional statement & it’s converse.