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Authoritative PPT Summary
"Area of a Circle" Circle PPT (Lesson 2)
Part One: Exciting Introduction
How to find the area of a circular lawn?
8 yuan per square meter of turf. How much does it cost to lay a full lawn?
Area of a circle PPT, part 2 content: knowledge explanation
Example 1: The diameter of the circular lawn is 20m, and the lawn is 8 yuan per square meter. How much does it cost to lay a full lawn?
First use the formula S=π r² to find the area of the circular lawn.
20÷2＝10(m)
3.14×10²＝314（m²）
314×8=2512 (yuan)
Answer: It costs 2512 yuan to cover the entire area with turf.
The silver part of the disc is a ring with an inner radius of 2cm and an outer radius of 6cm. What is the area of the ring?
A ring is the part between two concentric circles of different radii.
Subtract the area of the inner circle from the area of the outer circle to equal the area of the annulus.
Subtract the area of the inner circle from the area of the outer circle = the area of the annulus.
3.14×62-3.14×22
=3.14×36-3.14×4
=113.04-12.56
=100.48（cm2）
Answer: The area of the ring is 100.48cm2.
Area of a circle PPT, part 3: practice and consolidation
1. Find the area of the shaded area in the figure below.
The area of the shaded part = the area of the large circle – the area of the small circle
2. Find the area of the ring
3.14×(6÷2+2)2-3.14×(6÷2)2
=3.14×52-3.14×32
=3.14×25-3.14×9
=3.14×(25-9)
=3.14×16
=50.24(m2)
Answer: The area of the ring is 50.24m2.
Area of a circle PPT, part 4 content: knowledge summary
Use the area formula of a circle to solve problems related to the area of a circle in life;
The formula for the area of a ring: area of outer circle - area of inner circle = area of ring
Represented by letters: S=πR2-πr2 or S=π(R2-r2)
Area of a Circle PPT, Part 5: Summary of Harvests
Classmates, what knowledge have you learned in this class?
Keywords: Free download of PPT courseware for sixth grade mathematics from the People's Education Press, PPT download of the area of a circle, PPT download of a circle, .PPT format;
For more information about the "Area of a Circle" PPT courseware, please click on the Circle PPT Area of a Circle PPT tab.
"Area of a Circle (2)" Circle PPT courseware download:
Download the circle PPT courseware "Area of a Circle (2)" Part One: Classroom Introduction 1. Master the formula for calculating the area of a circle. 2. Be able to use the knowledge of circle area to solve some simple practical problems. 3. Experience the idea of turning a curve into a straight line, and initially experience the idea of extremes. ... ... ....
"Area of a Circle (2)" Circle PPT teaching courseware:
"Area of a Circle (2)" Circle PPT Teaching Courseware Part One: Preparation before class Learning focus: Use the area calculation formula of a circle to solve simple practical problems. Learning difficulty: Use the area calculation formula of a circle to calculate the area of a more complex combined figure containing a circle. ..
"Area of a Circle (2)" Circle PPT Download:
"Area of a Circle (2)" Download Circle PPT Part One: Review Introduction The size of the plane occupied by a circle is called the area of the circle. What is the formula for the area of a circle? S=r What is the derivation process of the area formula of a circle? The area formula is to fold the circle in half, divide it into two semicircles, and divide each...