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Authoritative PPT Summary
"Exploring the Properties of Axisymmetry" Axisymmetric PPT Courseware 2
Do it
Fold a rectangular piece of paper in half, then poke the number "14" with the tip of a pen, then open the paper and lay it flat.
(1) In the picture above, what is the relationship between the two "14"? Symmetric about the straight line l
(2) During the process of tying characters, point E coincides with point E`, and point F coincides with point F`. Assuming that the straight line where the crease is located is l, what is the relationship between the line segment connecting point E and point E` and l? What about point F and point F`?
can be bisected perpendicularly by straight line l;
(3) What is the relationship between line segment AB and line segment A`B`? What about CD and C`D`?
respectively equal;
(4) What is the relationship between ∠1 and ∠2? What about ∠3 and ∠4? Tell me your reasons.
respectively equal.
Give it a try:
1. Among the following figures, find the axis-symmetric figure and its two sets of corresponding points.
2. Find the axially symmetrical figure in each figure below and find its two corresponding line segments.
3. Please draw the symmetrical figures of the following figures about the straight line l.
(1) Please draw the symmetry point A’ of point A about the straight line l
(2) Please draw the symmetrical line segment A’B’ of line segment AB about straight line l
(3) Please draw the symmetrical figures △A’B’C’ of △ABC about the straight line l.
summary
1. The line segments connected to corresponding points are bisected perpendicularly by the axis of symmetry;
2. Corresponding line segments are equal and corresponding angles are equal.
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"Exploring the Properties of Axisymmetry" Axisymmetric PPT Courseware 3:
"Exploring the Nature of Axial Symmetry" Axis Symmetry PPT Courseware 3 Preparation for the experimental operation before class: Fold a rectangular paper in half and use the tip of a pen to poke the number 14. Open the paper and lay it flat. Cooperation and communication: 1. In the picture, two 14 what is the relationship? 2. During the process of tying words, click E and...
"Exploring the Properties of Axisymmetry" Axisymmetric PPT courseware:
"Exploring the Nature of Axial Symmetry" Axis Symmetry PPT Courseware Review Introduction Axisymmetric Figures: If a figure is folded in half along a certain straight line, and the parts on both sides of the straight line can completely overlap, then this figure is called an axial symmetric figure. This straight line is called the axis of symmetry of this figure. ..