Deductive Reasoning in Geometry

The video tutorial introduces deductive reasoning, explaining how conclusions are drawn from given facts and statements. It covers conditional statements, the law of detachment, and the law of syllogism, using examples to illustrate these concepts. The tutorial emphasizes the importance of matching conditions to draw valid conclusions and warns against extrapolating without explicit rules. The video concludes with encouragement for further learning.

What is deductive reasoning?

• Assuming something without evidence.

• Making a guess based on intuition.

• Drawing a conclusion based on given facts and statements.

• Drawing a conclusion based on emotions.

In a conditional statement, if the hypothesis is true, what can be said about the conclusion?

• The conclusion is irrelevant.

• The conclusion is false.

• The conclusion is true.

• The conclusion is unknown.

If it is Saturday, then there is no school. If someone tells you it is Saturday, what can you conclude?

• There is no school today.

• It is summer vacation.

• It is a holiday.

• It is Sunday.

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CCSS.RI.6.1

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If Mark saves $30, then he can buy a new video game. Mark saves $30. What can be concluded?

• Mark can buy a new video game.

• Mark cannot buy a new video game.

• Mark will save more money.

• Mark will buy a book.

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CCSS.4.MD.A.2

If a quadrilateral is a rhombus, then it is also a parallelogram. ABCD is a rhombus. What can be concluded?

• ABCD is a rectangle.

• ABCD is a square.

• ABCD is a parallelogram.

• ABCD is a triangle.

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CCSS.HSG.CO.C.11

If you are 18 years old, then you can register to vote. Olivia is not 18. What can be concluded?

• Olivia can register to vote.

• Olivia cannot register to vote.

• No valid conclusion can be drawn.

• Olivia is 18 years old.

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CCSS.RI.6.1

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What is extrapolating in the context of deductive reasoning?

• Making a guess based on intuition.

• Drawing a conclusion based on emotions.

• Drawing a conclusion based on given facts.

• Drawing a conclusion without an explicit rule.

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CCSS.RI.7.8

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What is the Law of Syllogism?

• A method to draw conclusions based on a single statement.

• A method to combine two conditional statements where the conclusion of the first is the hypothesis of the second.

• A method to guess the outcome of an event.

• A method to draw conclusions based on emotions.

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CCSS.RI.6.1

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CCSS.RI.7.1

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If it is Saturday, then Jake has a baseball tournament. If Jake has a baseball tournament, then he will need to pack his lunch. What can be concluded?

• If Jake has a baseball tournament, it is not Saturday.

• If it is Saturday, Jake will not have a baseball tournament.

• If Jake packs his lunch, it is not Saturday.

• If it is Saturday, Jake will need to pack his lunch.

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CCSS.RI.7.1

CCSS.RI.8.1

CCSS.RI.9-10.1

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If it is sunny this weekend, then you will go boating. If it is sunny this weekend, then you will wear shorts. What can be concluded?

• No valid conclusion can be drawn.

• You will only wear shorts.

• You will only go boating.

• You will go boating and wear shorts.

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CCSS.RI.6.1

CCSS.RI.9-10.1

CCSS.RL.7.1

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