"Comparing the Length of Line Segments" Basic Plane Graphics PPT Courseware

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"Comparing the Length of Line Segments" Basic Plane Graphics PPT Courseware

in conclusion:

The shortest line segment among all lines between two points.

Properties of line segments: Between two points, the line segment is the shortest.

Distance between two points: The length of the line segment between two points is called the distance between two points. (non-negative number)

Rule and compass drawing

Use a ruler and compass to draw a line segment equal to a known line segment. Specific steps:

(1) First use a ruler to draw a ray AC;

(2) Use a compass to measure the length of the known line segment (recorded as a)

(3) Taking A as the center of the circle on ray AC, intercept AB=a

So line segment AB is the line segment you want to construct.

How to compare the length of line segments

1. Measurement method: Use a scale to measure the length of each line segment, and then compare the length of the line segments according to the length. This method is to compare the length of the line segments from the perspective of numbers.

For example, AB=8cm AC=6cm. Because 8>6, AB>AC.

2. Coincidence method: overlap the endpoints of the two line segments and place the other endpoint on the same side of the endpoint. Compare the length of the line segments by looking at the position of the other endpoint. This method compares the length of line segments from a shape perspective.

Lesson summary:

1. Properties of line segments: The line segment is the shortest among all connections between two points.

2. How to draw a line segment: Use a ruler and compass to draw a line segment equal to the known line segment.

It can be summarized as: (1) draw (2) measure (3) cut.

3. Comparison of line segments: measurement method and coincidence method (compare the length of line segments from the two aspects of "number" and "shape" respectively

4. Two concepts:

(1) Distance between two points: The length of the line segment between two points is called the distance between two points.

(2) Midpoint of the line segment: Point B divides the line segment AC into equal

Two line segments AB and BC, point B is called the midpoint of line segment AC,

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"Comparing the Length of Line Segments" Basic Plane Graphics PPT Courseware 3:

"Comparing the Length of Line Segments" Basic Plane Graphics PPT Courseware 3 Among all the lines between two points, the line segment is the shortest. The length of the line segment between two points is called the distance between the two points. As shown in the figure, point M is on line segment AB Above, please compare the sizes of line segment A M and line segment B M. (Use...

"Comparing the Length of Line Segments" Basic Plane Graphics PPT Courseware 2:

"Comparing the Length of Line Segments" Basic Plane Graphics PPT Courseware 2 Among all the lines connected between two points, the line segment is the shortest. The length of the line segment between two points is called the distance between the two points. Activity 1 Given the line segment a, please use a compass and ruler to construct a line segment AC so that AC=a. 1. Use...

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Update Time: 2024-10-02

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