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"Regular Polygons and Circles" PPT courseware download
Part One: Problem Exploration
Question 1. What kind of figure is a regular polygon?
A polygon with equal sides and equal angles is a regular polygon.
Question 2. Can you name a few common regular polygons?
Question 3
Can a regular polygon be centrally symmetrical in addition to being axially symmetrical? If so, what conditions need to be met? How many axes of symmetry are there, and what is the center of symmetry?
Yes, when the number of sides of a regular polygon is an even number, it is a centrally symmetrical figure.
There are countless axes of symmetry
Its center is the center of symmetry. Its center of symmetry is the intersection point of the lines connecting the corresponding vertices of the regular polygon.
Regular polygons and circles PPT, Part 2: Consolidation exercises
1. Is a rectangle a regular polygon? What about a rhombus? What about a square? Why?
A rectangle is not a regular polygon because all four sides are not equal;
A rhombus is not a regular polygon because its four angles are not all equal;
A square is a regular polygon. Because all four sides are equal, all four angles are equal.
We call the center of the circumscribed circle of a regular polygon the center of the regular polygon.
The radius of the circumscribed circle is called the radius of the regular polygon.
The central angle subtended by each side of a regular polygon is called the central angle of the regular polygon
The distance from the center to the regular polygon is called the edge-center distance of the regular polygon.
Regular polygons and circles PPT, the third part: summary
In this lesson you should master:
1. Concepts related to regular polygons and circles: center, radius, central angle, and distance between sides and centers of regular polygons.
2. Equivalent relationship between the radius, central angle, side length, and edge-to-center distance of a regular polygon.
Keywords: Free download of mathematics PPT courseware for the second volume of the ninth grade of Hebei Education Edition, regular polygon and circle PPT download, .PPT format;
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"Regular Polygons and Circles" PPT teaching courseware:
"Regular Polygons and Circles" PPT teaching courseware Part One: Regular Polygons Regular polygons: A polygon with equal sides and equal angles is called a regular polygon. For example, the conditions satisfied by a regular pentagon are AB=BC=CD=DE=EA A=B=C=D=E Regular n-sided polygon: If a..
"Regular Polygons and Circles" PPT download:
"Regular Polygons and Circles" PPT Download Part One Content: Main Points, Test Points Focus 1. The focus of this lesson is the calculation methods of regular polygons, the calculation methods of the perimeter and area of circles and simple combined figures. 2. The definition of regular polygons: All sides are equal, so are all angles...
"Regular Polygons and Circles" PPT:
"Regular Polygons and Circles" PPT Part One Content: New Lesson Explanation Question: What is the relationship between regular polygons and circles? Thinking: Divide ⊙O into 5 equal arcs, and connect these equal points in sequence. What figure will you get? Why? We use the incircle to connect positive five..