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Pls help!! it's due in an hour!!
find the area of the circles ​

Pls help!! it's due in an hour!! find the area of the circles ​-example-1
User Maciek
by
7.9k points

1 Answer

7 votes

Answer:

7) 28.27 cm²

8) 63.62 ft²

9) 113.10 in²

Explanation:

You want the areas of the circles with the given diameters.

Area

The area formula for a circle is usually written in terms of the radius of the circle. Since the diameter is given, we can rewrite the formula to make use of the diameter:

A = πr²

A = π(d/2)² . . . . . . . use d/2 for r

A = (π/4)d² . . . . . . . collect constants

Application

7) Diameter = 6 cm; Area = (π/4)(6 cm)² = 9π cm² ≈ 28.27 cm²

8) Diameter = 9 ft; Area = (π/4)(9 ft)² = 20.25π ft² ≈ 63.62 ft²

9) Diameter = 12 in; Area = (π/4)(12 in)² = 36π in² ≈ 113.10 in²

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Pls help!! it's due in an hour!! find the area of the circles ​-example-1
User Tiago Peres
by
8.4k points

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