Geometry Quiz C 2AB: Intro to Logic thru Negation

Every time you drink milk, you get sick. So, you are lactose intolerant.

• Inductive

• Deductive

Answer explanation

observed pattern - inductive

All students must wear DCHS sweatshirts. I am a student. I must wear a DCHS sweatshirt.

• Deductive

• Inductive

Answer explanation

based on membership in class - deductive

Which is a counterexample of: Any number divisible by 3 is also divisible by 9.

• 81

• 63

• 30

• 20

Tags

CCSS.4.OA.B.4

Which of these is a counterexample to the following statement?

All dogs are small

• Poodle

• Chihuahua

• Tiger

• Great Dane

• an angle is straight

• if an angle is straight

You will earn extra credit on the paper you turned in early.

What do you call the underlined portion in this conditional statement?

• abstract

• conclusion

• generalization

• hypothesis

Given the hypothesis and the conclusion respectively, transform into an if-then statement.

Hypothesis: two lines are parallel

Conclusion: they do not intersect

• If it does not intersect, then it is parallel.

• If two lines are parallel, then they do not intersect.

• Two lines are parallel, if they do not intersect.

• If they do not intersect, they are lines.

Re-write the statement “An angle that measures 170° is an obtuse angle” into if-then form

• If it is an obtuse angle, then it measures 170°.

• If an angle measures 170°, then it is an obtuse angle.

• If obtuse angle is given, then it has 170°.

• If it has 170°, then it is obtuse .

Match the following

• Negation of the conclusion

• Conclusion

• Negation of the hypothesis

• Hypothesis

Select the negation of this statement:

The Earth is round in a shape

• The Earth is round not in a shape

• The Earth is round in a not shape

• Not the Earth is round in a shape

• The Earth is not round in a shape