The ratio of radii of two spheres is 5:4.the ratio of their whole surface area a will be
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sy160170:
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4πr1^2/4πr2^2= then 4 cuts4 and π cuts π so r1^2 and r2^2 remains
r1^2/r2^2=(5)^2/(4)^2=25/16
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Please slove this Ques :- if the curved surface area of a sphere is 64πcm^2 ,then it's volume will be
CSA of sphere is 4πr^2 so by solving we get r=4cm
volume =4/3πr^3 putting values we get volume is equals to 5632/21=268.19cm^3
My book answer is 85.3cm^2
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Answer:
25:16
Step-by-step explanation:
let the radius of sphere 1 be R and sphere 2 be r
TSA of a sphere is = 4pie r^2
ratio of there TSA = 4 pie R^2: 4 pie r^2
TSA1:TSA 2= R^2/r^2
= 5*5/4*4
= 25/16
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