"Central Symmetric Figures" Rotation PPT Courseware 3

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"Central Symmetric Figures" Rotation PPT Courseware 3

Review and Reflection

(1) What characteristics do these graphics have in common? They are all rotationally symmetrical figures.

(2) What are the differences between these graphics? How many degrees did it rotate around the center of rotation?

The rotation angle of the first figure is 120° or 240°, and the rotation angle of the second figure is 72° or 144° or 216° or 288°. The rotation angles of the last three figures are all 180°, and the second and third figures are axis-symmetric figures.

(1) Is a parallelogram a centrally symmetrical figure? If so, find its center of symmetry and try to verify your conclusion.

(2) Based on the above process, what properties of parallelograms can you verify?

(1) A parallelogram is a centrally symmetrical figure, and the center of symmetry is the intersection of the two diagonals.

(2) Be able to verify that the opposite sides of a parallelogram are equal, the opposite angles are equal, and the diagonals bisect each other.

Multiple choice questions:

(1) Which of the following figures is both an axially symmetrical figure and a centrally symmetrical figure ( )

A angle B equilateral triangle C line segment D parallelogram

(2) Among the following polygons, which one is a centrally symmetrical figure rather than an axially symmetrical figure ( )

A parallelogram B rectangle C rhombus D square

Decide whether the following statements are correct

(1) Axisymmetric graphics are also centrally symmetrical graphics. ( )

(2) Rotational symmetrical figures are also centrally symmetrical figures. ( )

(3) Parallelograms, rectangles and squares are all centrally symmetrical figures, and the intersection of the diagonals is their center of symmetry. ( )

(4) An angle is an axially symmetrical figure and a centrally symmetrical figure. ( )

(5) In two centrally symmetrical figures, the corresponding line segments are parallel (or on the same straight line) and equal. ( )

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For more information about the PPT courseware "Rotation Center Symmetry Figures", please click the Rotation ppt Center Symmetry Figures ppt tab.

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Update Time: 2024-10-02

This template belongs to Mathematics courseware People's Education Press Ninth Grade Mathematics Volume 1 industry PPT template

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