"Calculate the area of ​​a circle given its diameter" PPT courseware on the circumference and area of ​​a circle

Description

"Calculate the area of ​​a circle given its diameter" PPT courseware on the circumference and area of ​​a circle

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 given diameter and be able to solve simple practical problems in life.

3. Feel the close connection between mathematics and life, enhance students’ application awareness, and improve their ability to use knowledge to solve practical problems.

review review

1. What are the formulas for the circumference and area of ​​a circle?

2. Calculate.

(1) The radius of the flower bed is 10 meters. What is the area of ​​this flower bed in square meters?

(2) The diameter of the flower bed is 20 meters. What is the area of ​​this flower bed in square meters?

A company wants to build a circular lawn in front of the office building.

Do the math: How many square meters of turf are needed? (Keep the result as an integer)

3.14×(11/2)²

=3.14×30.25

≈95 (square meters)

Answer: Approximately 95 square meters of turf is required.

Add a round wooden cover to the water tank below. The diameter of the wooden cover is 10 cm longer than the diameter of the tank mouth. What is the area of ​​the wooden cover?

90＋10＝100（cm）

3.14×(100/2)²

=3.14×2500

=7850 (square centimeters)

Answer: The area of ​​the wooden cover is 7850 square centimeters.

practice

1. The diameter of the circular sign on the right is 40 cm. Find its area.

3.14 × (40÷2)²

=3.14×400

=1256 (square centimeters)

Answer: Its area is 1256 square centimeters.

2. Find the areas of the following circles.

3.14 × (6 ÷2)² 3.14 × (14 ÷2)²

=3.14 ×9 =3.14 ×49

=28.26 (square centimeters) =153.86 (square centimeters)

3. Find the areas of the following round tabletops.

d＝60cm d＝90cm d＝110cm

3.14×(6 0÷2)² 3.14×(9 0÷2)² 3.14×(110÷2)²

＝2826(cm²) ＝6358.5(cm²) ＝9498.5(cm²)

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For more information about the PPT courseware "Perimeter and area of ​​a circle, find the area of ​​a circle if its diameter is known", please click on the circumference and area ppt of a circle, find its area if the diameter of a circle is known ppt tags.

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Update Time: 2024-10-04

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

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