find the radius of a sphere whose surface area is 154 cm square
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Answer : 3.5 cm
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Solution :
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Given that : Total surface area of sphere = 154 cm^2
As we know that : Total surface area of sphere = 4πr^2
According to the question :
=> 4πr^2 = 154
=> r^2 = (154×7)/(22×4)
( π = 22/7 )
=> r^2 = 49/4
=> r = 7/2 =3.5 cm
_______________
Solution :
____________
Given that : Total surface area of sphere = 154 cm^2
As we know that : Total surface area of sphere = 4πr^2
According to the question :
=> 4πr^2 = 154
=> r^2 = (154×7)/(22×4)
( π = 22/7 )
=> r^2 = 49/4
=> r = 7/2 =3.5 cm
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