"Ratio and Proportion" PPT courseware

Description

"Ratio and Proportion" PPT courseware

learning target

Understand the concept of proportion

Understand the basic properties of proportion

Able to use the basic properties of proportion to solve problems

communication and discovery

It is known that the radius of ⊙O1 is r1, the perimeter is l1, and the area is S1. The radius of ⊙O2 is r2, the perimeter is l2, and the area is S2.

Find l1:l2; S1:S2

What did you find?

l1:l2 =r1:r2; S1:S2=r²1:r²2

Example: The gravity of a person on the moon is different from that on the earth. The ratio between the two is 1:6. If an astronaut's gravity on Earth is 750 N, what is his gravity on the moon?

Solution Assume that the astronaut's gravity on the moon is x N. According to the question, we get x:750=1:6

According to the basic properties of proportion, we get 6x=750

Solve to get x=125

Therefore, the astronaut's gravity on the moon is 125 N.

Do it:

On an enlarged picture of a dragonfly, measure the width of the dragonfly's wings in acm. Knowing that the scale of the picture is 1:0.2, find the actual width of the dragonfly's wings.

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Update Time: 2024-09-29

This template belongs to Mathematics courseware Qingdao Edition Eighth Grade Mathematics Volume 1 industry PPT template

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