"Scale" Graphic transformation and position determination PPT courseware

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"Scale" Graphic transformation and position determination PPT courseware

When drawing maps and other floor plans, it is necessary to reduce (or expand) the actual distance by a certain ratio before drawing it on the drawing. At this time, it is necessary to determine the ratio of the distance on the map to the corresponding actual distance.

What does the scale 1:100 mean?

A distance of 1 centimeter in the picture is equivalent to a distance of 1 meter in reality.

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

Distance on the map/actual distance = scale

1 Classification of scales

1:40000 1/5000

(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 length units 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". If it is written in fractional form, the numerator should also be simplified to "1".

1. Judgment.

1. The scale of a picture is 1:200 meters. ( )

2. Line segment scale and numerical scale can be converted to each other. ( )

3. The ratio of the actual distance to the distance on the map is called the scale. ( )

4. The scale bar 30:1 means that 1 cm on the picture is equivalent to 30 cm in actual distance. ( )

scale

Definition: The ratio of the distance on the image to the actual distance in a picture.

Calculation formula: distance on the map: actual distance = scale

Classification according to the representation of the scale

Numerical scale Line segment scale

Depending on whether to reduce or enlarge the actual distance

Reduce the scale Enlarge the scale

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Update Time: 2024-09-30

This template belongs to Mathematics courseware Western Normal University Edition Sixth Grade Mathematics Volume 1 industry PPT template

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