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Authoritative PPT Summary
"Beauty of Patterns" PPT courseware 4
1. Situation introduction
What are the characteristics of these graphics?
What questions can you ask?
2. Cooperation and exploration
What are the characteristics of these graphics?
Fold the figure in half along a straight line. If the parts on both sides of the straight line can completely overlap, such a figure is called an axially symmetric figure.
The line along which the crease lies is called its axis of symmetry.
Can you draw the other half of the figure below to make it axially symmetrical?
1. First find a few important points from the graph;
2. Then find the symmetry points of these points based on the distance from each point to the symmetry axis;
3.Finally connect the dots.
3. Independent practice
1. Which of the following numbers are axisymmetric figures? How many axes of symmetry do they have?
2. How many axes of symmetry can be drawn in each of the following figures? Give it a try.
3. Draw the other half of each figure below to make it an axially symmetrical figure.
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"Beauty of Patterns" PPT courseware 5:
"Beauty of Patterns" PPT courseware 5 1. Situation introduction It is composed of 5 identical ones. How did you get it? It is composed of 6 identical ones. How did you get it? What questions can you ask based on this information? What mathematical information do you know from the picture? ..
"Beauty of Patterns" PPT courseware 3:
"Beauty of Patterns" PPT Courseware 3 The opposite direction of clockwise rotation is counterclockwise rotation. The same direction as clockwise rotation is clockwise rotation. How to use rotation to obtain this windmill-shaped pattern? Rotate 90 degrees clockwise around point O. Rotate counterclockwise around point O 3 times continuously.
"Beauty of Patterns" PPT courseware 2:
"Beauty of Patterns" PPT Courseware 2 What is an axially symmetrical figure? A figure that is folded in half along a straight line so that the parts on both sides can completely overlap is an axially symmetrical figure. The line along which the crease lies is called its axis of symmetry. The straight line where the crease is located is called the graphic...