"Calculating the area of ​​a given circle's circumference" PPT courseware on the circumference and area of ​​a circle

Description

"Calculating the area of ​​a given circle's circumference" PPT courseware on the circumference and area of ​​a circle

teaching objectives

1. Combined with specific examples, experience the process of comprehensively applying 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 simple practical problems related to the area of ​​a circle.

3. Understand the close connection between mathematics and life, gain experience in using mathematics to solve practical problems, and improve practical problem-solving abilities.

review review

1. The radius of a circle is 2 cm, what is its diameter? What is the circumference of the circle? What is the area of ​​a circle?

2. The diameter of a circle is 5 decimeters. What is the area of ​​the circle in decimeters?

A yurt with a circular bottom area has a circumference of 25.12 meters measured along the ground. How many square meters does it cover?

Think about how to calculate the area if you know the perimeter?

2×3.14×r＝25.12

r＝25.12÷6.28

r＝4

3.14×4² =3.14×16

=50.24 (square meters)

Answer: The yurt covers an area of ​​50.24 square meters.

Desktop area:

3.14×(120/2)² =11304 (square centimeters)

The first desktop area:

110×110=12100 (square centimeters)

The second desktop area:

120×120=14400 (square centimeters)

The third desktop area:

140×150=19600 (square centimeters)

practice

1. There is a circular reservoir, and its circumference measured along the ground is 31.4 meters. Can you find the area occupied by this reservoir?

First calculate the radius of the reservoir:

2×3.14×r＝31.4

r＝31.4÷6.28

r＝5

Reservoir area:

3.14×5²＝3.14×25

=78.5 (square meters)

Answer: The area of ​​this reservoir is 78.5 square meters.

2. Xinghua Primary School has a circular flower pond with a circumference of 18.84 meters. How many square meters does it cover?

18.84÷3.14÷2

=6÷2

=3 (meter)

3.14×3²＝3.14×9＝28.26 (square meters)

Answer: The area of ​​this flower pond is 28.26 square meters.

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For more information about the PPT courseware "The circumference and area of ​​a circle is known. Calculate the area by knowing the circumference of a circle", please click the "Perimeter and area of ​​a circle ppt. Calculate the area by knowing the circumference of a circle ppt" tag.

File Info

Update Time: 2024-11-20

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

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