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(B) Let the radius of the sphere be $r \, cm$.The surface area of a sphere is given by the formula $4 \pi r^2$.Given that the surface area is $154 \,

Vedclass · Accepted Answer

$3.5$

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(B) Let the radius of the sphere be $r \, cm$.The surface area of a sphere is given by the formula $4 \pi r^2$.Given that the surface area is $154 \, cm^2$,we have:$4 \pi r^2 = 154$Substituting $\pi = \frac{22}{7}$:$4 	imes \frac{22}{7} 	imes r^2 = 154$Solving for $r^2$:$r^2 = \frac{154 	imes 7}{4 	imes 22}$$r^2 = \frac{7 	imes 7}{4} = \left(\frac{7}{2}ight)^2$Taking the square root of both sides:$r = \frac{7}{2} = 3.5 \, cm$Thus,the radius of the sphere is $3.5 \, cm$.

Find the radius of a sphere whose surface area is $154 \, cm^2$. (in $, cm$)

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