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Authoritative PPT Summary
"Scale" Proportional and inverse proportion PPT courseware
teaching objectives
1. Understand the meaning of scale and be able to correctly determine the scale of floor plans.
2. Able to apply knowledge of proportions to find distances on the map or actual distances based on the scale.
The ratio of the distance on the picture to the actual distance is called the scale of the picture.
Distance on the map: actual distance = scale
(1) The scale bar is different from the general ruler. It is a ratio and should not have a unit of measurement.
(2) When calculating the scale, the unit lengths of the front and back items must be converted into units of the same level.
(3) The first term of the scale should generally be simplified to "1".
Which of the following passages are scales and which are not? Why?
Draw a rectangle 20 meters long and 10 meters wide on the drawing paper. The length is 5 centimeters and the width is 2.5 centimeters.
(1) The ratio of the length in the picture to the actual length is 1/400 ()
(2) The ratio of the width on the picture to the actual width is 1:400 ( )
(3) The ratio of the area on the picture to the actual area is 1:160000 ( )
(4) The ratio of the actual length to the length on the picture is 400:1 ( )
Summary of the whole lesson
In this lesson we learned about scale and learned that the ratio of the distance on the picture to the actual distance is called the scale of the picture. And can calculate the distance on the map or the actual distance based on the scale. It should be noted that in calculations, the units of the distance on the map and the actual distance must be the same.
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