the volume of 2 sphere are in the ratio 64 is to 27 find the difference of their surface areas if the sum of their radii is 7 cm
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Given,
4πR³:4πr³=64:27
R³:r³=64:27
R:r=4:3
R=4x, r=3x
A.T.Q
R+r=7
4x+3x=7
x=1
R=4, r=3
Curved Surface Area=4πR²=4π4²sq cm.
Curved Surface Area=4πr²=4π3²sq.cm
4π4²-4π3²=4π(4²-3²)
=4π(16-9)
=4×22/7×7
=88sq.cm.Ans
4πR³:4πr³=64:27
R³:r³=64:27
R:r=4:3
R=4x, r=3x
A.T.Q
R+r=7
4x+3x=7
x=1
R=4, r=3
Curved Surface Area=4πR²=4π4²sq cm.
Curved Surface Area=4πr²=4π3²sq.cm
4π4²-4π3²=4π(4²-3²)
=4π(16-9)
=4×22/7×7
=88sq.cm.Ans
gdjrudkbd:
thanks
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