"Axisymmetry" PPT courseware

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"Axisymmetry" PPT courseware

1. Definition of axially symmetrical figures and symmetry axes:

1. Fold a figure along a straight line. If the parts on both sides of the straight line can overlap each other, the figure is an axially symmetrical figure.

2. This straight line is the axis of symmetry of this figure

2. Definition of axial symmetry and symmetry points:

1. For two figures on a plane, fold one of the figures along a certain straight line. If it can coincide with the other figure, then the two figures are said to be symmetrical about this straight line, which is called axial symmetry for short. The straight line is called the axis of symmetry

2. The corresponding points in the two figures (that is, the points that coincide with each other when the two figures overlap) are called symmetry points about this line.

Note: If a point is on the axis of symmetry, its symmetry point is itself

The difference and connection between "axisymmetric graphics" and "axisymmetric"

the difference:

"Axisymmetric figure" refers to a figure in which two parts of the same figure overlap when they are folded along a straight line.

"Axisymmetric" means that two figures are located on both sides of a straight line, and when folded along this straight line, the two figures coincide.

connect:

(1) There is an axis of symmetry in the definition, and they must be folded and overlapped along this line.

(2) If two axially symmetrical figures are regarded as a whole, then the overall figure is an axially symmetrical figure;

If an axially symmetric figure is divided into two parts along the symmetry axis as two figures, then the two figures are axially symmetrical.

1. Judgment

1.Axisymmetric figures must have an axis of symmetry ( )

2. Axisymmetric graphics have at least one axis of symmetry ( )

3. Two figures that are axially symmetric about a certain straight line must overlap each other ( )

4. Two figures that completely overlap each other must be axially symmetrical ( )

1. Which of the following conditions is met for a graph to be an axially symmetrical graph? ( )

(A) Two figures that can overlap each other

(B) If a figure is folded on a certain straight line, it can overlap with another figure.

(C) The shape and size of a figure on both sides of a straight line are the same

(D) A figure is folded along a straight line, and the parts on both sides of the straight line can overlap each other.

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"Axisymmetric" PPT:

"Axisymmetric" PPT Part 1 Content: New Lesson Introduction What characteristics did you find of these buildings? There are many symmetrical things and phenomena in life. Boats, people, plants and reflections in the water are all symmetrical. Take a small mirror and place it on an axially symmetrical figure or object...

"Axisymmetry" PPT courseware 6:

"Axisymmetric" PPT Courseware 6 If a figure is folded along a straight line, and the parts on both sides of the straight line can overlap each other, then the figure is called an axially symmetric figure, and the straight line is called the axis of symmetry. Practice it. The following figures are all axially symmetrical figures. Please find out...

"Axisymmetric" PPT courseware 5:

"Axisymmetric" PPT courseware 5 Review of old knowledge What is an axially symmetric figure? What is the axis of symmetry? If a figure is folded along a straight line and the parts on both sides of the straight line can completely overlap, the figure is called an axially symmetric figure. This straight line is called the axis of symmetry.

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Update Time: 2024-11-20

This template belongs to Mathematics courseware People's Education Press Eighth Grade Mathematics Volume 1 industry PPT template

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