Hebei Education Edition Fifth Grade Mathematics Volume 2

Description

"Axisymmetric" PPT

Part One: Introduction of New Course

What characteristics do you notice about 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. See where you place it. The image seen in the mirror is exactly half of the figure or object.

Answer: Place it at the axis of symmetry.

Part Two: Analysis of Examples

Example 1: Observe the following figures, talk about which figures are axially symmetrical, and use origami to determine how many axes of symmetry each figure has.

A square has 4 axes of symmetry.

A circle has countless axes of symmetry.

Give it a try:

1. Many Chinese characters are symmetrical, such as "Jia", "王", etc.

Please write ten such Chinese characters.

Answer: mouth, two, crystal, ten, three, mountain, middle, day, field, product.

2. Find the axis of symmetry of each figure below and draw it.

Example 2: Observe the axially symmetrical figure drawn on the graph paper below. What did you find?

The distance between point A and point A′ to the axis of symmetry is 2 squares.

The distances between point B and point B′ to the axis of symmetry are both 4 squares.

The distance between point A and point A′ to the axis of symmetry is 2 squares.

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For more information about the "Axisymmetric Motion of Graphics" PPT courseware, please click on the "Axisymmetric Motion of Graphics ppt" ppt tag.

"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.

"Axisymmetric" PPT courseware 4:

"Axisymmetric" PPT courseware 4 We say that two such figures form _____. This straight line is called _____. The symmetrical points in the two figures (that is, the points that overlap each other in the two figures after folding in half) are called _____. If two The graph is axially symmetrical about a certain straight line, then...

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