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Math
how do you find the surface area of a sphere if the circonference measures 20 pie ft? A. 1256.6ft squared B. 10ft squared C. 314.2ft squared D. 62.8ft squared
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A hole of a radius of 1cm is pierced in a sphere of a 4cm radius. Calculate the volume of the remaining sphere. I know that the volume of a sphere with an exterior radius is of: V = pie(R^2  r^2) dH where R^2 is the exterior
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direct variation the surface area of a sphere varies directly as the square of the radius. if the surface area of a sphere is 36 pi meters squared when the radius is 3 meters, what is the surface area of a sphere with a radius of
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A hole of a radius of 1cm is pierced in a sphere of a 4cm radius. Calculate the volume of the remaining sphere. I know that the volume of a sphere with an exterior radius is of: V = pie(R^2  r^2) dH where R^2 is the exterior
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Why isn't the surface area of a sphere with radius r the following: 2*pi * (pi*r) That comes from the following flow of logic: Doesn't it makes sense to think of the surface area of the sphere with radius r as the the
asked by John on January 26, 2014 
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1. The Volume Of A Sphere Is 2100 cm Cube And Its Radius Is xcm. Find The Value Of x And Hence The Curved Surface Area Of The Sphere(take pie=22/7). 2. A Hemispherical Bolw Of Diameter 30cm Has The Same Volume As A Cylinder Of
asked by Anonymous on January 7, 2016 
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The radius, r, of a sphere is increasing at a constant rate of 0.05 meters per second. A. At the time when the radius of the sphere is 12 meters, what is the rate of increase in its volume? B. At the time when the volume of the
asked by Mishaka on January 17, 2012 
math
The volume enclosed by a sphere of radius r is (4/3)πr^3. The surface area of the same sphere is 4πr^2. You may already have noticed that the volume is exactly (1/3)r times the surface area. Explain why this relationship should
asked by maath on July 24, 2018 
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3.A rectangular prism has a width of 92ft and a volume of 240ft.Find the volume of a similar prism with a width of 23ft.Round to the nearest tenth, if necessary. 4.A pyramid a height of 5in. and a surface area of 90in^2.Find the
asked by anndreana on February 22, 2017 
math
the volume of a sphere is 4/3 pie radius squared. given that pie is 3.142 and radius is 7.3 calculate the volume of the sphere
asked by sam on February 20, 2016