"Positional Similarity of Figures" PPT Courseware 2

Description

"Positional Similarity of Figures" PPT Courseware 2

Review before class:

What is a bitmap? That is, its characteristics are:

Similar, the lines connecting corresponding points intersect at one point; the corresponding line segments are parallel (or collinear)

If you connect the following points in sequence, what shape will you get?

(0,0) (6,0) (6,4) (0,4) (0,0)

(1) Divide the abscissa and ordinate of the coordinates of each point above by 2 to draw this new figure.

(2) Can you find any relationship between these two graphics?

Give it a try:

It is known that the vertex O of △OAB is the origin of the coordinates. The horizontal and vertical coordinates of each vertex of A(-1, 2), B(-3, 0), and △OAB are expanded to 3 times the original value, and the points O′,A are obtained. ,′B′. Is it a similar figure connecting OA′, OB′, OC′, △OA′B′ and △OAB? If so, what is the center point?

Think about it: if the coordinates of each vertex of a figure are expanded or reduced by the same multiple, what is the relationship between the resulting figure and the original figure? What is the coordinate origin?

Summarize

If the polygon has a vertex at the origin of the coordinates and an edge on the X-axis, then expand (or reduce) the vertex coordinates of the polygon by the same multiple respectively, and the resulting graph will be similar to the original graph, and the origin of the coordinates is them The position is like the center.

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For more information about the PPT courseware "Position of Figures", please click on the "Position of Figures" PPT tab.

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"Positional similarity of similar polygons and figures" PPT courseware 2:

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Update Time: 2024-07-06

This template belongs to Mathematics courseware Qingdao Edition Ninth Grade Mathematics Volume 1 industry PPT template

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