"View" PPT

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"View" PPT

Part One: Problem Exploration

Question 1: In order to describe this house well, from which directions do we need to look?

Question 2: If you want to build a house and you are an engineer, what kind of drawings do you need to provide to the builder?

Three-view method: Look at an object from three different directions: front, top, and side (left or right), and then draw three pictures of what you see, that is, views.

What are three views of spatial graphics?

Concept: View refers to the graphic obtained by projecting an object onto the projection surface according to the orthographic projection.

1. The projection of light projected backward from the front of an object is called the main view or front view.

2. The top-down view is called a top view.

3. View from left to right is called left view.

View PPT, part 2: the formation of three views

Flatten the front view, top view, and left view on a plane to get three views.

1. The length of the shape is reflected in both the front view and the top view, and the length is aligned in the vertical direction. We call it long alignment.

2. The height of the shape is reflected in both the front view and the left view, and the height is flush in the horizontal direction, which we call high flush.

3. The width of the shape is reflected in both the left view and the top view, and the width of the same shape is equal. We call it equal width.

Correspondence rules of three views

Main view and top view----long alignment

Main view and left view----high level

Top view and left view----equal width

View PPT, the third part of the content: three views of the basic body

1. Basic body

1. Prism

⑴ Composition of prism

It consists of two bottom surfaces and several side edges. The intersection line between the side edges is called the side edge line, and the side edge lines are parallel to each other.

⑵ Three views of prism

2. Cone

(1) Composition of cone

It consists of a conical surface and a bottom surface.

(2) Three views of the cone

In the position shown in the figure, the top view is a circle. The other two views are equilateral triangles. The base of the triangle is the projection of the base of the cone, and the two waists are the projections of two contour lines in different directions of the cone.

3. Round ball

⑴ Formation of the ball

The circular generatrix is ​​rotated around its diameter.

⑵ Three views of the ball

The three views are respectively three circles with the same diameter as the sphere, and they are the projections of the contour lines of the sphere in three directions.

View PPT, part 4 content: summary

How to draw three views:

1. Before drawing, clarify the structure of the geometry.

2. The (main left) lengths are aligned, the (main left) heights are equal, and the (main left) widths are equal.

3. When reading a picture, it is impossible to determine its spatial shape based on a certain view, so it is necessary to connect and analyze related views to find out the relationship between each view, so as to grasp the shape of the entire three-dimensional figure.

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"View" Projection and View PPT Download (Lesson 2):

"View" Projection and View PPT Download (Lesson 2), 15 pages in total. Basics of knowledge points Knowledge point 1 Identify the three views of a prism 1. Jiajia gave her father a gift box on Father's Day this year. The front view of the gift box is (C) 2. As shown in the figure, the top view of the geometry is (A)..

"View" Projection and View PPT Download (Lesson 1):

"View" Projection and View PPT Download (Lesson 1), 13 pages in total. Basic knowledge points Knowledge points Three views of cylinder, cone and sphere 1. (Changchun High School Entrance Examination) Among the following three-dimensional figures, the main view is a circle (D) 2. (Kunming High School Entrance Examination) The left view of the following geometric bodies..

"View" Projection and View PPT Courseware (Lesson 2):

"View" Projection and View PPT Courseware (Lesson 2) Learning Objectives: Recognize geometry from three views. Calculation of geometry represented by three views... ... Understand new knowledge points. Recognize geometry from three views and imagine it from three views. Geometry: (1) Method: by..

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Update Time: 2024-09-30

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

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