Western Normal University Edition First Grade Mathematics Volume 1
Beijing Normal University Edition Seventh Grade Mathematics Volume 1
People's Education Press First Grade Mathematics Volume 1
People's Education Press Second Grade Mathematics Volume 1
People's Education Press Third Grade Mathematics Volume 1
Beijing Normal University Edition Seventh Grade Mathematics Volume 2
Qingdao Edition Seventh Grade Mathematics Volume 1
Beijing Normal University Edition Fifth Grade Mathematics Volume 1
Beijing Normal University Edition Eighth Grade Mathematics Volume 1
Hebei Education Edition Third Grade Mathematics Volume 1
People's Education High School Mathematics Edition B Compulsory Course 2
Hebei Education Edition Seventh Grade Mathematics Volume 2
Hebei Education Edition Fourth Grade Mathematics Volume 2
Beijing Normal University Edition Fifth Grade Mathematics Volume 2
Qingdao Edition Seventh Grade Mathematics Volume 2
People's Education Press First Grade Mathematics Volume 2
Category | Format | Size |
---|---|---|
Western Normal University Edition Sixth Grade Mathematics Volume 1 | pptx | 6 MB |
Description
"Perimeter of a Circle" Circle PPT Courseware 4
The length of a circle of a closed figure on the plane is its perimeter.
The length of the curve surrounding a circle is called the circumference of the circle.
The quotient of a circle's circumference divided by its diameter is a fixed number. We call it pi, represented by the letter π.
π=3.141592653......
Judgment and analysis
1. π=3.14 ( )
2. As long as you know the diameter or radius of a circle, you can know the circumference of the circle. ( )
3. The pi of a large circle is greater than that of a small circle. ( )
(1) Today I learned about the circumference of a circle. I know that pi is the ratio of ( ) and ( ). It is represented by the letter ( ). It was discovered by the ancient Chinese mathematician ( ).
(2) I also know that the circumference of a circle is always ( ) times its diameter. If you know the diameter of a circle, you can use the formula ( ) to find the circumference; if you know the radius of the circle, you can use the formula ( ) to find the circumference.
The cross-sectional circumference of a wooden pile is 37.68 meters. What is its diameter in meters? (π is 3.14)
C=πd
Method 1: Use equations to solve. Let the diameter be x meters.
Method 2: Use arithmetic to solve. Diameter = Circumference ÷ π
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For more information about the "Perimeter of a Circle" PPT courseware, please click the "Perimeter of a Circle ppt circle ppt" tag.
"Use the circumference formula of a circle to solve practical problems" PPT courseware on the circumference and area of a circle:
"Using the Circumference Formula of a Circle to Solve Practical Problems" Circumference and Area of a Circle PPT Courseware Teaching Objectives 1. Combined with specific examples, experience the process of flexibly using the circle circumference formula to solve practical problems. 2. Be able to flexibly use the formula of circle circumference to solve simple practical problems, and be able to express...
"Calculate the area of a given circle's diameter" PPT courseware on the circumference and area of a circle:
"Calculate the area of a given circle's diameter" Circumference and area of a circle PPT courseware Teaching objectives 1. Combined with specific examples, experience the process of flexibly using the area formula of a circle to solve simple practical problems. 2. Master the calculation method of finding the area of a known diameter, and be able to solve simple problems in life..
"Calculate the area of a given circle's circumference" PPT courseware on the circumference and area of a circle:
"Calculating the Area of a Given Circumference" Circumference and Area of a Circle PPT Courseware Teaching Objectives 1. Combined with specific examples, experience the process of comprehensively using circle knowledge and life experience to solve practical problems. 2. Master the calculation method of finding the area of a given circle's circumference, and be able to solve problems related to circular surfaces..
File Info
Update Time: 2024-10-19
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