Question

find the radius of a sphere whose surface area is 154 cm square​

Answer 1

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

Answer 2

regr the attachment for abswer