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The distance around a circle is 56.55 meters long. I already know the diameter of it is about 18.01 meters long or something, but what is the area?

 

Here is another question~

The area of a circle is 452.39ft². What would the diameter have to be? And what would the circumference of the circle be too?

SucksAtMath  Dec 15, 2017
edited by SucksAtMath  Dec 15, 2017

Best Answer 

 #1
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1) 

Circumference = Diameter x Pi

Radius = Diameter / 2

56.55 =Diameter x 3.141593  Divide both sides by 3.141592

Diameter =56.55/3.141592

Diameter =18 m

Radius =18/2 = 9 m

Area = Radius^2 x Pi

Area = 9^2 x 3.141592

Area =254.47 m^2

 

2)

452.39 = Radius^2 x Pi

452.39 = Radius^2 x 3.141592      Divide both sides by 3.141592

144 = Radius^2                                 Take the square root of both sides

Radius = 12 Ft.

12 x 2 = 24 Ft - the diameter.

Circumference =24 x 3.141592

Circumference =75.4 Ft.

Guest Dec 15, 2017
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2+0 Answers

 #1
avatar
+1
Best Answer

1) 

Circumference = Diameter x Pi

Radius = Diameter / 2

56.55 =Diameter x 3.141593  Divide both sides by 3.141592

Diameter =56.55/3.141592

Diameter =18 m

Radius =18/2 = 9 m

Area = Radius^2 x Pi

Area = 9^2 x 3.141592

Area =254.47 m^2

 

2)

452.39 = Radius^2 x Pi

452.39 = Radius^2 x 3.141592      Divide both sides by 3.141592

144 = Radius^2                                 Take the square root of both sides

Radius = 12 Ft.

12 x 2 = 24 Ft - the diameter.

Circumference =24 x 3.141592

Circumference =75.4 Ft.

Guest Dec 15, 2017
 #2
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+1

THANK YOU

SucksAtMath  Dec 16, 2017
edited by SucksAtMath  Dec 16, 2017

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