"How to Draw Circles" Circle and Sector PPT Courseware Simple campus recruitment activity planning plan summary enterprise and institution recruitment publicity lecture PPT template is a general PPT template for business post competition provided by the manuscript PPT, simple campus recruitment activity planning plan summary enterprise and institution recruitment promotion Lecture PPT template, you can edit and modify the text and pictures in the source file by downloading the source file. If you want more exquisite business PPT templates, you can come to grid resource. Doug resource PPT, massive PPT template slide material download, we only make high-quality PPT templates!
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Authoritative PPT Summary
"How to Draw Circles" Circle and Sector PPT Courseware
teaching objectives
1. Experience the process of drawing a circle using your own method and using a compass as required.
2. Master the method of drawing a circle with a compass and know the functions of the center and radius of the circle.
3. Cultivate thinking skills such as observation, analysis, comparison, and generalization, and develop preliminary spatial concepts.
In our daily life and study, we often use compasses to draw circles.
Steps to draw a circle with a compass:
① Separate the two legs of the compass and determine the distance (i.e. radius) between the two legs;
② Fix one foot with the needle tip at one point (i.e., the center of the circle);
③ Rotate the foot with the pencil tip once to draw a circle.
give it a try
Determine the length of the radius yourself, draw a circle with a compass and mark the center and radius.
What does the size of a circle have to do with it?
The size of a circle is related to its radius.
①The smaller the radius of the circle, the smaller the circle; the larger the radius of the circle, the larger the circle.
②The position of the circle is determined by the center of the circle.
practice
1. Use a compass to draw a circle.
(1) r＝2.5cm (2) d＝4cm
2. Draw a circle as required.
3. Multiple choice questions:
(1) When drawing a circle, the distance between the two legs of the compass is ( ).
A. Radius length B. Diameter length
(2) The line segment from the center of the circle to any point ( ) is called the radius.
A. Center of circle B. Outside of circle C. On circle
(3) The point ( ) that passes through the center of the circle and both ends are on the circle is called the diameter.
A.Diameter B.Line segment C.Ray
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