| Category | Format | Size |
|---|---|---|
| People's Education Press Eighth Grade Mathematics Volume 1 | pptx | 6 MB |
"Using Coordinates to Express Axial Symmetry" Axial Symmetry PPT Courseware
Description
"Using Coordinates to Express Axial Symmetry" Axial Symmetry PPT Courseware
Summary: The characteristics of the coordinates of a point that is symmetrical about the x-axis are: the abscissas are equal and the ordinates are opposite numbers to each other.
practise:
1. Point P(-5, 6) and point Q are symmetrical about the x-axis, then the coordinates of point Q are __________.
2. Point M (a, -5) and point N (-2, b) are symmetrical about the x-axis, then a=_____, b =_____.
Summary: The characteristics of the coordinates of a point that is symmetrical about the y-axis are: the abscissas are opposite numbers to each other, and the ordinates are equal.
practise:
1. Point P(-5, 6) and point Q are symmetrical about the y-axis, then the coordinates of point Q are __________.
2. Point M (a, -5) and point N (-2, b) are symmetrical about the y-axis, then a=_____, b =_____.
What did you learn in this lesson?
1. Learned the characteristics of the coordinates of points that are symmetrical about the x-axis and the y-axis in the plane Cartesian coordinate system.
The abscissas of points that are symmetrical about the x-axis are equal and the ordinates are inverse to each other. The abscissas of points that are symmetrical about the y-axis are inverse to each other and the ordinates are equal.
2. Learned how to draw a symmetrical figure about the x-axis or y-axis in the plane Cartesian coordinate system
First find the coordinates of the corresponding points of some special points in the known figure (such as the vertices of polygons), trace and connect these points, and you can get the axially symmetrical figure of this figure.
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Update Time: 2024-07-09
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