+0

# HELP PLZ

+1
59
2
+7

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

#1
+1

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
Sort:

#1
+1

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
+7
+1

THANK YOU

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

### 20 Online Users

We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  See details