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The ratios of areas of two spheres is 1:4. Find the radius of larger one if the small...
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Area of a sphere is given by;
`A = 4pir^2`
Let us say the area of the large sphere is rcm.
`A_L = 4pir^2 ---(1)`
`A_M = 4pi(5)^2 -----(2)`
`A_L/A_M = r^2/25`
`4/1 = r^2/25`
`r^2 = 100`
`r = 10`
So the radius of the larger sphere is 10cm.
Posted by jeew-m on July 4, 2013 at 10:09 AM (Answer #1)
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