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2.2 Biconditional Statements 
September 06, 2011 
Bellwork 
1. What is the definition of conjecture? A guess based on observation 
2. Write the next number in the sequence 1, 5, 9, 13,... 17 
3. A _______ disproves a conjecture. counterexample 
4. (­4)( 
7)+2 ­1=? 
­27 
5. Are you lost yet in chapter 2? 
HW pg. 83 #16­25 
1
2.2 Biconditional Statements 
September 06, 2011 
2.2 Analyze Conditional Statements 
Conditional Statement: 
logical statement that has 2 parts-hypothesis 
& conclusion 
written in if-then form 
Ex. If it is raining, then there are clouds in the sky. 
Rewrite the conditional statement in if-then form. 
All birds have feathers. 
If an animal is a bird, then it has feathers. 
2 angles are supplementary if they are a linear pair 
If 2 angles are a linear pair, then they are 
supplementary. 
HW: pg 82 #3-5 
HW pg. 83 #16­25 
2
2.2 Biconditional Statements 
September 06, 2011 
· Conditional statements can be T or F. 
· Prove that the conclusion is true every time 
the hypothesis is true. 
· To show false: give 1 counterexample. 
Negation: Opposite of original statement 
Original: Ball is red. 
Negation: Ball is not red. 
Conditional Statement: If m A = 99, then A is obtuse. 
T 
Converse: exchange the hypothesis and conclusion 
If m A is obtuse, then m A = 99. 
F 
Inverse: negate both the hypothesis and conclusion 
If m A ≠99, then A is not obtuse. 
F 
Contrapositive: write the converse, then negate both hypothesis 
and conclusion 
If A is not obtuse, then m A ≠ 99. 
T 
HW pg. 83 #16­25 
3
2.2 Biconditional Statements 
September 06, 2011 
HW: pg. 82 
#3-5,7-15,31 & 32 
HW pg. 83 #16­25 
4
2.2 Biconditional Statements 
September 06, 2011 
You can write a definition as a conditional statement 
in if-then form or as its converse. 
Both are True. 
Definition: If 2 lines intersect to form a right 
angle, then they are perpendicular lines. 
Converse: If 2 lines are perpendicular, then they 
intersect to form a right angle. 
You can write "line l is perpendicular to line m" 
as l m. 
l 
m 
HW pg. 83 #16-18 
HW pg. 83 #16­25 
5
2.2 Biconditional Statements 
September 06, 2011 
Biconditional Statement: 
· When conditional statement and converse are T, then 
you can write them as a biconditional statement. 
· if and only if (IFF) 
· any valid definition can be written as biconditional 
HW pg. 83 #16­25 
6
2.2 Biconditional Statements 
September 06, 2011 
HW pg. 83 #16­25 
7
2.2 Biconditional Statements 
September 06, 2011 
HW pg.83 
#16-25 
HW pg. 83 #16­25 
8

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2.2 p2 notes

  • 1. 2.2 Biconditional Statements September 06, 2011 Bellwork 1. What is the definition of conjecture? A guess based on observation 2. Write the next number in the sequence 1, 5, 9, 13,... 17 3. A _______ disproves a conjecture. counterexample 4. (­4)( 7)+2 ­1=? ­27 5. Are you lost yet in chapter 2? HW pg. 83 #16­25 1
  • 2. 2.2 Biconditional Statements September 06, 2011 2.2 Analyze Conditional Statements Conditional Statement: logical statement that has 2 parts-hypothesis & conclusion written in if-then form Ex. If it is raining, then there are clouds in the sky. Rewrite the conditional statement in if-then form. All birds have feathers. If an animal is a bird, then it has feathers. 2 angles are supplementary if they are a linear pair If 2 angles are a linear pair, then they are supplementary. HW: pg 82 #3-5 HW pg. 83 #16­25 2
  • 3. 2.2 Biconditional Statements September 06, 2011 · Conditional statements can be T or F. · Prove that the conclusion is true every time the hypothesis is true. · To show false: give 1 counterexample. Negation: Opposite of original statement Original: Ball is red. Negation: Ball is not red. Conditional Statement: If m A = 99, then A is obtuse. T Converse: exchange the hypothesis and conclusion If m A is obtuse, then m A = 99. F Inverse: negate both the hypothesis and conclusion If m A ≠99, then A is not obtuse. F Contrapositive: write the converse, then negate both hypothesis and conclusion If A is not obtuse, then m A ≠ 99. T HW pg. 83 #16­25 3
  • 4. 2.2 Biconditional Statements September 06, 2011 HW: pg. 82 #3-5,7-15,31 & 32 HW pg. 83 #16­25 4
  • 5. 2.2 Biconditional Statements September 06, 2011 You can write a definition as a conditional statement in if-then form or as its converse. Both are True. Definition: If 2 lines intersect to form a right angle, then they are perpendicular lines. Converse: If 2 lines are perpendicular, then they intersect to form a right angle. You can write "line l is perpendicular to line m" as l m. l m HW pg. 83 #16-18 HW pg. 83 #16­25 5
  • 6. 2.2 Biconditional Statements September 06, 2011 Biconditional Statement: · When conditional statement and converse are T, then you can write them as a biconditional statement. · if and only if (IFF) · any valid definition can be written as biconditional HW pg. 83 #16­25 6
  • 7. 2.2 Biconditional Statements September 06, 2011 HW pg. 83 #16­25 7
  • 8. 2.2 Biconditional Statements September 06, 2011 HW pg.83 #16-25 HW pg. 83 #16­25 8