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Mathematics 8 Online
OpenStudy (anonymous):

MEDAL!!! Estimate the diameter of a circle with a circumference of 80 feet.

OpenStudy (anonymous):

@Jesstho.-. @El_Arrow @pooja195

OpenStudy (anonymous):

that a radius, a radius is half of a diameter

OpenStudy (anonymous):

yes, I just explained what it is

pooja195 (pooja195):

I meant of the circle?

OpenStudy (anonymous):

no, all the information is on the question

pooja195 (pooja195):

As in did u find the radius yet?

OpenStudy (anonymous):

no

pooja195 (pooja195):

ok 80/2=?

OpenStudy (anonymous):

40

pooja195 (pooja195):

good now use the formula I gave to find the answer

pooja195 (pooja195):

A=pi times radius^2

pooja195 (pooja195):

@mathmate

pooja195 (pooja195):

thats the formula now try it out :) sorry for the confusin

OpenStudy (anonymous):

whats the boxes?

pooja195 (pooja195):

oh refresh your page

OpenStudy (anonymous):

oh nvm

OpenStudy (anonymous):

so, multiply circumference by 2?

pooja195 (pooja195):

\[A=\frac{ A=C^2 }{ 4π } \]

pooja195 (pooja195):

might have to refresh the page

OpenStudy (mathmate):

Hint: \(circumference = 2\pi r\) r=radius 2r = diameter Substitute the given values and try to solve for r (radius) or 2r=diameter.

OpenStudy (anonymous):

so, is the answer 25.48ft.?

OpenStudy (mathmate):

Lemme see...

OpenStudy (mathmate):

Can you explain how you got the answer?

OpenStudy (mathmate):

Yes, your answer is correct...to 3 significant figures. I get 25.46 ft.

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