"Application of Proportion" Proportion PPT Courseware 2

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"Application of Proportion" Proportion PPT Courseware 2

1. Review old knowledge

The ratio of the distance on the picture to the actual distance in a picture is called the scale of the picture.

What are the forms of scales? How to find the scale of a picture?

2. Explore new knowledge

Below is a schematic map of Beijing's rail transit routes. The length of Metro Line 1 from Pingguoyuan Station to Sihuidong Station in the picture is about 7.8 cm. How many kilometers is the actual length from Pingguoyuan Station to Sihuidong Station?

3. Application of knowledge

A model of the Leaning Tower of Pisa made at a scale of 1:100 is 54.5 centimeters high. How many meters is the actual height of the Leaning Tower of Pisa?

In production, sometimes because machine parts are relatively small, it is necessary to expand the actual size to a certain multiple before drawing it on the drawing. The picture on the right is a cross-sectional view of a machine part drawn at a scale of 6:1. What is the actual length of the outer diameter of this part in millimeters?

The picture on the right is a floor plan of a building drawn at a scale of 1:4000. What is the actual square footage of this building?

Tip: To find the floor area, we can first find the actual length and width of the rectangle.

3. Assign homework

Homework: Do it on page 54; Exercise 10 on page 57, questions 5 and 6; Exercise 10 on page 58, question 12.

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For more information about the "Application of Proportions and Proportions" PPT courseware, please click on the "Proportions ppt Application of Proportions ppt" tab.

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Update Time: 2024-11-09

This template belongs to Mathematics courseware People's Education Press Mathematics Volume 2 for Sixth Grade industry PPT template

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