circular pool w/ circumference of 23 ft. Pool is surrounded by a fence 2.5 ft apart from edge of the pool. What is the circumference of the fence?

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justaguide's profile pic

justaguide | College Teacher | (Level 2) Distinguished Educator

Posted on

The radius of the circular pool is 23 feet. Circumference of a circle is given by 2*pi*r

2*pi*r = 23

=> r = 23/(2*pi)

The pool is surrounded by a fence that is 2.5 feet apart.

This increases the radius of the fence by 2.5.

The circumference of the fence is 2*pi*[23/(2*pi)) + 2.5]

=> 5*pi + 23

The circumference of the fence is 23 + 5*pi feet.

hala718's profile pic

hala718 | High School Teacher | (Level 1) Educator Emeritus

Posted on

Given the circumference of the pool is 23 feet.

Let us calculate the radius.

==> C = 2* r * pi

==> 23 = 2*r * pi

==> r= 23/2pi = 3.66 ft

Now we need to determine the circumference of the fence.

First lest determine the radius.

We know that the radius is the pool is 3.66

Also, the fence is 2.5 ft from the pool.

Then the radius of the fence is 3.66 + 2.5 = 6.16

Now we will calculate the circumference.

==> C = 2* r * pi = 2* 6.16 * pi = 38.708 ft

Then the circumference of the fence is 38.708 ft.

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