"Side development of right prism and cone" PPT courseware

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"Side development of right prism and cone" PPT courseware

Part One: Understanding of Right Prisms

Observe the following three-dimensional figures. They are all right prism objects. Think about what characteristics their shapes have in common?

1. Understanding of right prisms:

It has the following characteristics:

(1) There are two surfaces parallel to each other, and they are called bottom surfaces;

(2) The remaining faces are all rectangles, and they are called sides;

(3) The side edge (referring to the common edge of the two sides) is perpendicular to the bottom surface.

Both cuboid and cube are right square prisms.

A prism whose base is a regular polygon is called a regular prism.

Side expansion diagram of right prism and cone PPT, part 2 content: understanding of cones

1. A cone is surrounded by a base and a side. Its base is a circle and the side is a curved surface.

2. The line connecting any point on the circumference of the cone base and the vertex of the cone is called the generatrix of the cone.

Question: How many generatrix are there in the cone?

3. The line segment connecting the vertex and the center of the base is called the height of the cone.

4. The formation process of the cone

The relationship between the base radius of the cone, the height line, and the generatrix length:

5. Side view of the cone

Side expansion diagram of right prism and cone PPT, the third part of the content: summary sublimation

1. "One graph, three relationships, two formulas", understand the relationships and remember the formulas;

Side area and total (surface) area of ​​a cone

The circumference of the base of a cone is the arc length of its side expansion fan.

The generatrix of a cone is the radius of its lateral expansion sector.

2. Processing method of three-dimensional graphics-converting into plane geometric graphics

Side expansion diagram of right prism and cone PPT, part 4 content: ability improvement

1. The radius of the base of the cone is 3cm, and the length of the busbar is 6cm. Then the central angle of the fan-shaped side expansion diagram of the cone is _______.

2. The side area of ​​a cone is twice the area of ​​the base. The central angle of the fan-shaped side expansion of this cone is ____.

3. The radius of a sector is 30cm and the central angle is 120 degrees. Use it to make the side of a cone. Then the radius of the base of the cone is _____.

4. The radius of the base of the cone is 10cm, and the length of the busbar is 40cm. The shortest length for an ant on the circumference of the base to go around the side is _______.

Keywords: Free download of mathematics PPT courseware for the second volume of the ninth grade of the Hebei Education Edition, PPT download of side expansion diagrams of right prisms and cones, .PPT format;

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Download the PPT courseware of "Side Development of Right Prisms and Cones":

"Side Development of Right Prisms and Cones" PPT courseware download part one content: The development of geometry introduced into scenarios is widely used in production time. Through the development of geometry, three-dimensional models can be determined and produced, and the relative geometry of related geometry can also be calculated. side..

"Side expansion diagram of right prism and cone" PPT download:

"Side development diagrams of right prisms and cones" PPT download Part 1 content: Learning objectives: 1. Understand the side development diagrams of right prisms and cones, and further develop spatial concepts 2. Be able to use the knowledge of side development diagrams of right prisms and cylinders to solve problems Practical problems. observe ..

"Side development of right prism and cone" PPT:

"Side Development of Right Prisms and Cones" PPT Part One Content: Cooperative Learning Please cut a cube paper box along some edges so that the six faces are connected together and developed into a plane figure. What kind of plane can you get? Graphics? After cutting the cube along some edges...

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Update Time: 2024-07-11

This template belongs to Mathematics courseware Hebei Education Edition Ninth Grade Mathematics Volume 2 industry PPT template

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