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How do you find the area of a circle if all you have is the circumference?
Wiki User
∙ 13y ago
The formula for the area of a circle is pi(r2)...ie: 3.14xr2
The circumference is pi(diameter)
and
the radius (r) is half of the diameter (d)
Example...if the circumference is 25.12in then the area is 50.24in
Work being...
Circumference = 3.14(d)=25.12
To find the diameter you have to get d by itself...
Divide 3.14 to both sides to do that
3.14/3.14(d)=25.12/3.14
d=8
Now that you have the diameter you know that the radius is half of the diameter so radius (r)=4
Therefore the area of the circle is 3.14(42)=50.24in
Wiki User
∙ 13y ago
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What do you know about all the diameters of a circle?
The diameter of a circle is directly proportionate to the circumference. You can find the diameter of a circle by dividing the circumference by the value of Pi (3.14) OR you can find the circumference by multiplying Pi by the diameter. it is a line that halves a circle
Is the circumference and area the same thing?
no, the cimcumference is the perimeter of the circle and the area included what is inside of the circle, area can be used for all shapes
How do you find the circumference when you have area?
if your talking about a circle, then: Area = pi*radius^2, so you can use the area to find the radius, and then all you need to do is use the formula Circumference = 2*pi*r If its a different shape it gets slightly more tricky
How do you find the circumference of a circle if the area is 49?
You need just a smidgen of algebra.The area of any circle is (pi) x (radius)2 .For this circle, you know that (pi) x (radius)2 = 49.You can massgae this around to find the radius, and thenthe circumference is just (2 pi) x (radius).If you need it all in one step, then Circumference= 2 x sqrt(pi x Area) ,but the other way is easier for me, because I don't have to memorizeanother formula. I find deriving easier than memorizing..
How do you find the radius if you do not know the diameter?
You can measure it. Otherwise, you certainly have to know SOMETHING about the circle to calculate the radius, usually the diameter, the circumference, or the area. If you don't know anything at all about a circle, you can't find out the radius, either.
How would the area of a circumerancebe affected when the diameter of a circle is doubled or triple?
First of all, there's no such thing as the "area of a circumference". The distancearound the circle is called the "circumference", and the area of the circle is calledthe "area of the circle".-- When the diameter of the circle is doubled, the circumference is doubledand the area is multiplied by 4.-- When the diameter of the circle is tripled, the circumference is tripledand the area is multiplied by 9.-- When the diameter of the circle is multiplied by N, the circumference ismultiplied by N and the area is multiplied by N2 .
How do you find the are of a circle with only the circumference?
It's important to know the formulas for all these characteristics of circles, and to recognize what they have in common. Area of a circle = πr2 Circumference of a circle = 2πr or dπ Where in the above equations r represents radius, and d is diameter (2r). Both these equations have r in them. Find the radius using the circumference equation, and then plug it into the equation for Area
How do you find the surface area of a circle?
you find the surface area of a circle by first finding the area of the circles/ two ends. you do this by multiplying the diameter by pi then multiply by two, that is both ends put together then you find the area of the flat part by finding out the circumference of the circle ends, then multiply that by the height of the cylinder. circumference= pi times the diameter then add all your calculation together, and you have the surface area of your cylinder :)
What do you know about all the diameters of a circle?
The diameter of a circle is directly proportionate to the circumference. You can find the diameter of a circle by dividing the circumference by the value of Pi (3.14) OR you can find the circumference by multiplying Pi by the diameter. it is a line that halves a circle
Is the circumference and area the same thing?
no, the cimcumference is the perimeter of the circle and the area included what is inside of the circle, area can be used for all shapes
How do you find the circumference when you have area?
if your talking about a circle, then: Area = pi*radius^2, so you can use the area to find the radius, and then all you need to do is use the formula Circumference = 2*pi*r If its a different shape it gets slightly more tricky
Is circumference larger than radius?
Yes it is. Circumference is the whole area of the circle. Radius is from the middle to the side of the circle. Yes it is. The radius it half way across the circle from the center, while the circumference is all the way around the circle. The diameter is all the way across the circle, while being twice the radius. The circumference is about 3.14 times the diameter (or Pi if you prefer).
How is pi related to a circle?
Pi (π) is intertwined with the circle in all sorts of ways. First of all, it is the ratio of a circle's circumference compared to its diameter. Meaning, if a circle has a diameter of 1 m, its circumference is π m, or roughly 3.14 m.You also use π to find the area of a circle, the formula being πr2You can get into more complicated uses of π and circles in calculus and physics, but it all relates back to its ratio constant for circumference.
How do you find the circumference of a circle if the area is 49?
You need just a smidgen of algebra.The area of any circle is (pi) x (radius)2 .For this circle, you know that (pi) x (radius)2 = 49.You can massgae this around to find the radius, and thenthe circumference is just (2 pi) x (radius).If you need it all in one step, then Circumference= 2 x sqrt(pi x Area) ,but the other way is easier for me, because I don't have to memorizeanother formula. I find deriving easier than memorizing..
How do you find the area of a circle inside a square?
all you do is find the area of the circle... if you mean find the squares area, find the area of the circle, and then the square's area and subtract the squares area to the circles area
How do you find the radius if you do not know the diameter?
You can measure it. Otherwise, you certainly have to know SOMETHING about the circle to calculate the radius, usually the diameter, the circumference, or the area. If you don't know anything at all about a circle, you can't find out the radius, either.
How do you find the height of a cylinder when all your given is surface area and diameter?
Divide the surface area by the circumference of the circle, which is a product of the diameter x Pi. Essentially, an unrolled cylinder is a rectangle.
