Mathematics
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OpenStudy (anonymous):
MEDAL!!!
Estimate the diameter of a circle with a circumference of 80 feet.
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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
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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
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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
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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.
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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.