Yahoo Answers: Answers and Comments for 13 year old math problem? [Mathematics]
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Thu, 12 Feb 2009 16:20:28 +0000
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Yahoo Answers: Answers and Comments for 13 year old math problem? [Mathematics]
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From Puzzling: There is a formula for the area of a circle.
...
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Fri, 13 Feb 2009 00:25:30 +0000
There is a formula for the area of a circle.
A = π r²
π is the value pi which is approximately 3.14159
r is the radius.
Now remember that the radius is the distance from the center to the edge of the circle while the diameter is the full distance across. Thus the radius is *half* the diameter.
In your question, the diameter is 2.5 feet, so the radius is 1.25 feet.
Plug the value in to find the area.
A = π r²
A = (3.14159) * (1.25)²
A ≈ 4.9 sq. feet
P.S. Some books use 3.14 as approximate value of π and others use 22/7. You should still get about 4.9 sq. ft.

From Anonymous: you would use the formula for area or a circle...
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Fri, 13 Feb 2009 00:46:29 +0000
you would use the formula for area or a circle
(A = πr 2) pi times radius squared
well you divid the diameter by 2 and you get your radius = 1.25
and then you use the formula above to get the answer

From Anonymous: ummm, the are of a circle is.
A = πr^2 ...
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Fri, 13 Feb 2009 00:30:43 +0000
ummm, the are of a circle is.
A = πr^2 [are of circle]
A = π(1.25)^2 [substitute 1.25 for the radius, cause radius is half of the diameter]
A = π(1.5625) [1.5625 is 1.25 squared]
A = 4.90 [answer]
i think that's what the answer is.
haha, if that's not right, someone help her.
:]

From Anonymous: the area of a circle is pie(radius)^2
1. firs...
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Fri, 13 Feb 2009 00:29:08 +0000
the area of a circle is pie(radius)^2
1. first find half of 2.5 to find the radius
radius = 1.25
2. find the square of the radius (1.25)
1.25^2= 1.5625
3. multiply 1.5625 by pie (3.1415...)
4. area will be around 4.9 square ft

From frecklesarelovely: There is a formula for the area of a circle.
...
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Fri, 13 Feb 2009 00:28:57 +0000
There is a formula for the area of a circle.
A = π r²
π is the value pi which is approximately 3.14159
r is the radius.
Now remember that the radius is the distance from the center to the edge of the circle while the diameter is the full distance across. Thus the radius is *half* the diameter.
In your question, the diameter is 2.5 feet, so the radius is 1.25 feet.
Plug the value in to find the area.
A = π r²
A = (3.14159) * (1.25)²
A ≈ 4.9 sq. feet
P.S. Some books use 3.14 as approximate value of π and others use 22/7. You should still get about 4.9 sq. ft.

From kbob: this is how i would go about figuring this one...
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Fri, 13 Feb 2009 00:27:31 +0000
this is how i would go about figuring this one out and remember math can be fun and figured out in alot of creative ways find the way you understand it!
But i would draw a circle (fountain)
line across circle is 2.5 feet. (diameter)
i don't remember off the top of my head for the equation for this. But its diameter times something equals area.
you got it girl...

From Melody: Area of circle= pir2
pi=3.14
2=squared
Diam...
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Fri, 13 Feb 2009 00:26:56 +0000
Area of circle= pir2
pi=3.14
2=squared
Diameter=2 radius
A=pir2
A=3.14(1.25x 1.25)
A=3.14(1.5625)
A=4.90625
A=4.9

From ironduke8159: A = pid^2/4 = 6.25pi/4 = 4.9 ft^2
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Fri, 13 Feb 2009 00:26:06 +0000
A = pid^2/4 = 6.25pi/4 = 4.9 ft^2

From J: so are is pi times radius squared so all you n...
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Fri, 13 Feb 2009 00:24:44 +0000
so are is pi times radius squared so all you need to do is multiply half of the diameter (1.75) by itself 1.75x1.75 then multiply that by 3.14 which is pi! and then you have the area

From Anonymous: ask your parent! ha sry idk
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Fri, 13 Feb 2009 00:24:31 +0000
ask your parent! ha sry idk