"Why Proof" Proof of Parallel Lines PPT Teaching Courseware

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"Why Proof" Proof of Parallel Lines PPT teaching courseware, 17 pages in total.

Part One Content: Basic Knowledge Key Points

Knowledge Points Reasoning and Proof

1. If you use a saw to cut wood, the saw will generate heat; if you use a file to file something, the file will generate heat; if you sharpen a knife on a stone, the knife will generate heat, so the friction of the object will generate heat. The method used to reach this conclusion is (C)

A. Observation B. Experiment C. Induction D. Analogy

2. Which of the following conclusions you are not sure about (C)

A. The bisectors of adjacent supplementary angles are perpendicular to each other

B. In the same plane, two straight lines parallel to the same straight line are parallel to each other.

C. In the same plane, two straight lines perpendicular to the same straight line are perpendicular to each other.

D. Vertical angles are equal

3. (Zibo High School Entrance Examination) Four people A, B, C, and D played a table tennis round-robin match (each two people had to play one game). As a result, A defeated D, and A, B, and C won the same number of games. Then the number of games Ding wins is (D)

A.3 B.2

C.1 D.0

Why to prove PPT, part 2: comprehensive ability improvement

8. A theft occurred in a certain place, and the police station detained four criminal suspects, A, B, C, and D. During the interrogation, A said: "I did not do this." B said: "I did not do this. "Did it". C said: "A did it". Ding said: "C did it". As a result of the investigation, only one of the four people told lies, so the thief is (C)

A.A B.B

C.C D.D

9. There are 10 seats in a row, and some of the seats are already occupied. If another person comes, no matter where he sits, he is adjacent to another person, then the least number of people sitting there is (B)

A.3 B.4

C.5 D.6

Why do you need to prove PPT? Part 3: Expand, explore and break through

17. Paint the six sides of the cube with six different colors respectively, and draw flowers with different numbers. The colors on each side and the number of flowers are listed as follows: Now put the above-mentioned shapes with the same size, color, and flowers. Four cubes with exactly the same distribution form a horizontal cuboid (as shown in the picture). How many flowers are there on the bottom of the cuboid?

Solution: According to the meaning of the question, the bottom surface of the cube on the right is white, the bottom of the cube on the second right is green, the cube on the third right is yellow, and the bottom of the cube on the left is purple.

Then there are 4+6+2+5=17 flowers on the lower base of the cuboid.

Therefore, there are 17 flowers in total on the lower surface of the cuboid.

Keywords: Free download of Beijing Normal University edition eighth-grade mathematics PPT courseware for the first volume, why it is necessary to prove PPT download, proof of parallel lines PPT download, .PPT format;

For more information about the PPT courseware "Why should we prove the proof of parallel lines?", please click on the PPT label of "Why should we prove the proof of parallel lines PPT".

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Update Time: 2024-09-07

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