"Plane Graphics in Life" rich graphic world PPT courseware

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Beijing Normal University seventh grade first volume mathematics	pptx	6 MB

"Plane Graphics in Life" rich graphic world PPT courseware

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Upload Time: 2024-10-05

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"Plane Graphics in Life" rich graphic world PPT courseware

1. Please observe the four color pictures below and abstract the plane graphics. Can you "discover" familiar flat shapes from real life? Such as triangle, quadrilateral, pentagon, hexagon, circle, etc.

2. Some graphics we often see.

3. The concept of polygon

The shapes above are all polygons. Can you tell me what characteristics they have in common?

A polygon is a closed plane figure composed of line segments that are not on the same straight line and are connected end to end.

4. Starting from the same vertex of a polygon, connect this vertex to the other vertices respectively, and the polygon can be divided into several triangles. Can there be certain rules?

Number of sides of a polygon 4 5 6 7 8 … n …

Number of triangles 2 3 4 ____ ____ … ____ …

The line segment connecting two non-adjacent vertices of a polygon is called the diagonal of the polygon

Can you see any patterns?

Each n-sided polygon can be divided into ________ triangles.

Why (n-2)? Instead of (n-3)?

Class summary

There are a large number of graphics in life. Graphic intuition is an excellent tool for people to understand nature and social objects. We must be able to "discover" these graphics and understand the properties of some graphics. The graphics we know in this lesson:

(1) Polygon (2) Sector

Talk about your feelings!

1. Experience the process of abstracting flat graphics from the real world, and be able to dress up the world with beautiful graphics.

2. Understand polygons, sectors, and arcs in specific situations.

3. Develop organized thinking in a variety of activities, and be able to find unchanging patterns from changes in graphics.

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For more information about the PPT courseware "Plane Graphics in Life with a Rich Graphic World", please click on the "Plane Graphics in Life with Rich Graphic World" ppt tag.

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Update Time: 2024-10-05

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"Plane Graphics in Life" rich graphic world PPT courseware