"Perfect Graphics" PPT Courseware 2

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"Perfect Graphics" PPT Courseware 2

Get to know the circle

(1) Find a way to draw a circle on the paper.

A circle is a curved figure on a plane.

(2) Tell me how you drew the circle? Compare, what is the difference between the plane straight line graphics you have learned before and the circle you just drew?

Learn to draw a circle with a compass

(1) Understand compasses

(2) Steps to draw a circle with a compass

How to draw a circle: determine the radius, determine the center, and rotate once

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 in one circle to draw a circle.

Let’s do it together:

1. Ask students to draw a radius on a round piece of paper. Wait for 10 seconds to see how many lines they can draw. What about diameter?

2. Ask the students to use a ruler to measure how many centimeters the drawn radius is? what have you found? What about diameter?

3. Ask the group to discuss: In the same circle, what are the characteristics of the radius? What are the characteristics of diameter? What's the relationship between them?

Trial questions

1. Use a compass to draw a circle with a radius of 2 cm, and mark its center, radius, and diameter with the letters O, r, and d respectively.

2. Draw a circle with a diameter of 4 cm.

1. Judgment:

(1) Only 100 diameters can be drawn in the same circle. ( )

(2) The diameters of all circles are equal. ( )

(3) The line segment with both ends on the circle is called the diameter. ( )

(4) The radii of equal circles are all equal. ( )

2. 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

discuss:

1. Why are the wheels designed to be round?

2. If the wheels were made into square or triangular shapes, how would we feel when we sat on them?

Draw circles of various sizes and colors to create a beautiful picture.

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"Perfect Graphics" PPT courseware 5:

"Perfect Figure" PPT Courseware 5 A circle is a curved figure on a plane. This point in the center of the circle is called the center of the circle. The line segment connecting the center of a circle to any point on the circle is called the radius. The line segment that passes through the center of a circle and has both ends on the circle is called the diameter. Use the circle in your hand...

"Perfect Graphics" PPT courseware 4:

"Perfect Shape" PPT Courseware 4 What does area refer to? The size of the plane occupied by a circle is the area of ​​the circle. Do you still remember the derivation process of the areas of triangles and trapezoids? Guess: What does the area of ​​a circle depend on? Because: Area of ​​rectangle = Length and Width So: Circle..

"Perfect Graphics" PPT courseware 3:

"Perfect Shape" PPT Courseware 3 The circumference of the top of the Hall of Prayer for Good Harvests is 100 meters. The Circular Mound Altar has three floors, the upper floor is 30 meters in diameter, the middle floor is 50 meters in diameter, and the lower floor is 70 meters in diameter. Wrap the wire around the disc and measure its length. Roll the disc once and measure its length. The circumference of a circle divided by its diameter..

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Update Time: 2024-11-24

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

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