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Mathematics 8 Online
OpenStudy (anonymous):

A farmer has a fence that encloses a square plot with an area of 64 square meters. If the farmer uses this fence to enclose a circular flower garden, what will the area of the garden be?

jimthompson5910 (jim_thompson5910):

What is the side length of the square?

OpenStudy (anonymous):

it just says the area is 64 meters

OpenStudy (anonymous):

I think it would be 8 meters for each side

jimthompson5910 (jim_thompson5910):

good

jimthompson5910 (jim_thompson5910):

so what is the perimeter of that same square?

OpenStudy (anonymous):

but I am lost from there I know a circle is circumference is 2piR

OpenStudy (anonymous):

and the area is piR squared

jimthompson5910 (jim_thompson5910):

what is the perimeter of that same square?

OpenStudy (anonymous):

so the perimeter of the square would be 32 meters

jimthompson5910 (jim_thompson5910):

good

jimthompson5910 (jim_thompson5910):

so if you were to take that square and rearrange it into a circle, you'd have a circle with a circumference of 32 meters

jimthompson5910 (jim_thompson5910):

how can you use this to find the radius?

OpenStudy (anonymous):

so 32 equals 2 pi R

jimthompson5910 (jim_thompson5910):

good, now solve for r

OpenStudy (anonymous):

oh I was thinking 64 equaled the 2 pi r now I get it

jimthompson5910 (jim_thompson5910):

not quite, but I'm glad it's clicking now

OpenStudy (anonymous):

so r equals 5.09

jimthompson5910 (jim_thompson5910):

yes approximately

OpenStudy (anonymous):

thank you so much

OpenStudy (anonymous):

you were so helpful

jimthompson5910 (jim_thompson5910):

you're welcome and I'm glad I was of help to you

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