"Geometric Figures" PPT courseware 3

Description

"Geometric Figures" PPT courseware 3

communication and discovery

Look at the picture below. What do you notice?

Point movement to form a line, line movement to form a surface, surface movement to form a body

Geometric figures are made up of _______________.

___ is the basic element that makes up graphics.

Experimentation and inquiry

(1) Observe the three-dimensional shape of the packaging box. What panels is it composed of? Are the faces the same size and shape?

(2) What is the shape at the junction of the two surfaces?

(3) What is the shape where the edges meet?

(4) Count how many edges and vertices the cube has?

(5) Cut the packaging box along some of its edges and lay it on a flat surface. What kind of flat figure will be obtained? If the expansion methods are different, will the resulting graphics be the same? Do it and then draw it. How many kinds of flat graphics can you get? Communicate with classmates.

Challenge yourself

(1) Use scissors to cut off one corner of a square piece of paper. How many corners are left? After one cut, can six corners be left on the paper? Give it a try.

(2) A cube has a total of 6 faces. If the cube is cut into two pieces with a knife, how many faces will the two divided geometric bodies have? If cut, how to cut? Make a cube out of a radish, potato or plasticine and give it a try.

practise

1. Observe the shape on the right and fill in the blanks:

(1) The edge is formed by the intersection of ____ and _____;

(2) The vertex is formed by the intersection of _____ and _____.

2. How many faces does a cylinder consist of? What are they? What line does the side and base of a cylinder intersect?

3. Rotate each plane figure in the first row below around the dotted line (axis) in the figure to get the three-dimensional figure in the second row. Can you connect each plane shape with the rotated three-dimensional shape?

4. Each face of a cube is marked with letters. The picture on the right is an expanded view of the cube. please answer the following question:

(1) If face A is the face of the cube facing down, which face is facing up?

(2) If face F is facing forward and face B is facing left, which face is facing up?

(3) If face C is facing right and face D is facing back, which face is facing up?

Operation:

1. Fill out the form in Group B on page 17 of the textbook

2. Which of the four shapes below is expanded from the box on the left?

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Update Time: 2024-09-29

This template belongs to Mathematics courseware Qingdao Edition Seventh Grade Mathematics Volume 1 industry PPT template

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