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What is 2 x pi x r?

Updated: 4/28/2022
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circumferance

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Q: What is 2 x pi x r?
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What is the diameter of a 160 feet circle?

If circumference = 160', and circumference = 2 x pi x r, then... 160 = 2 x pi x r 80 = pi x r 80/pi = r 2(80/pi) = diameter = 50.99'


How do you find the are of a cylinder?

surface area=2 x pi x r² + 2 x pi x r x h volume = pi x r² x h


What does 2 pi r or 2 pi radius mean?

2 x Pi x r is equal to the circumference of a circle whose radius is equal to r.


What is the surface area of a circle with a circumference of 28?

Circumference of a circle: 2 x Pi x r (with r = the radius of the circle).Area of a circle: Pi x r x rThe circumference is 28, so:2 x Pi x r = 28r = 28 / (2 x Pi)Area = Pi x (28 / (2 x Pi)) x (28 / (2 x Pi)) = 62.4[rounded on one decimal] or more accurately (196 / Pi).


How do you find the radius of a circle if all you know is the circumference?

C = circumference r = radius C = 2 x pi x r C / 2 = pi x r C / 2 / pi = r


What happens to circumferences and areas when the radius of circle is multiplied by some number x?

The circumference of a circle is 2 * pi * r. If you multiple r by x you get 2 * pi * (r * x) which is the same as x * (2 * pi * r). So the circumference is multiplied by x. The area of a circle is pi * r2. Multiply r by x and you get pi * (rx)2 which is the same is (pi * r2) * x2. So the area gets multiplied by x2.


How do you find the radius of a sphere that has a ratio of 1 to 2 for volume and surface area?

Surface area of sphere is 4 x pi x r x r Volume of sphere is (4/3) x pi x r x r x r Hence ((4/3) x pi x r x r x r) / (4 x pi x r x r) = 1/2 ((4/3) x r) / (4) = 1/2 (1/3) x r = 1/2 r = 1 and 1/2


How do you find the surface area of a cylinder in terms of pi?

2 x pi x r = A so pi=A/r times2


What is a formula for calculating the radius of a circle when the circumference is known?

The way to find the circumference is either 2 x pi x r, or pi x d.So rearrange the formula:circumference = 2 x pi x rcircumference / 2 x pi = rSo take the circumference, and divide it by 2 pi and you have the radius.A:Using the formula for circumference which is 2(pi)r solve for r. Now you have radius = circumference/(2pi). The formula for area of a circle is (pi)r^2. Substituting r with circumference/(2pi) you get area = pi(circumference/(2pi))^2. When you simplify you get area = circumference^2/(4pi).


What if the formula for surface area of a cylinder?

The surface area of the vertical part of the cylinder is 2 x pi x r x h where r is the radius of the cylinder and h is the height. Now you have calculate the area of the two end circular areas. Each of them is pi x r x r, so two of them is 2 x pi x r x r Total surface area = (2 x pi x r)(h + r)


Why can C Pi x d or C 2 x Pi x r be used to find circumference?

Because [ d = 2 r ].


How do you figure the radius if you have the circumference?

The circumference C of a circle can be written as C = 2 x pi x r, where r is the radius. Thus, to get C, you divide both sides of the equation with 2 x pi and get r = C/(2 x pi).