Math, asked by sy160170, 1 year ago

The ratio of radii of two spheres is 5:4.the ratio of their whole surface area a will be

Answers

Answered by Anonymous
3
hope it will help you
Attachments:

sy160170: Please show full working
Anonymous: 4πr1^2/4πr2^2= then 4 cuts4 and π cuts π so r1^2 and r2^2 remains
Anonymous: r1^2/r2^2=(5)^2/(4)^2=25/16
Anonymous: done nd thanks
sy160170: Thanks
sy160170: Please slove this Ques :- if the curved surface area of a sphere is 64πcm^2 ,then it's volume will be
Anonymous: CSA of sphere is 4πr^2 so by solving we get r=4cm
Anonymous: volume =4/3πr^3 putting values we get volume is equals to 5632/21=268.19cm^3
sy160170: My book answer is 85.3cm^2
Answered by shebhinj14
2

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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