Question

find the radius of a sphere whose surface area 154cm
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Answer 1

Answer:

r = 3.5

Step-by-step explanation:

Unit Conversion:

Using formula:

A = 4 π r²

Solving for r

r = 1/2 √A/π = 1/2. √154/π = √3.5007

So , hope it will help...

Answer 2

Given,

Surface area of sphere is 154 cm^2

Surface area of sphere = 4πr^2

$4 \times \frac{22}{7} \times {r}^{2} = 154\\ {r}^{2} = \frac{154}{4} \times \frac{7}{22}\\{r}^{2} = \frac{49}{4} \\r = \sqrt{ \frac{49}{4} }\\r = \frac{7}{2}\\r= 3.5cm$

Therefore the radius is 3.5cm.