Question

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

Answer 1

surface area of sphere = 4πr^2
154=4*22/7*r^2
r=7/2cm

Answer 2

$\huge\boxed{\texttt{\fcolorbox{Red}{aqua}{Hey Mate!!!!}}}$

$<b>$ Here is your answer.

Given:

Surface Area of sphere = $154{cm}^{2}$

As we know,

The surface area of sphere
$= 4\pi {r}^{2}$
Now,
$\frac{4 \times 22 \times {r}^{2} }{7} = 154 {cm}^{2} \\ \\ {r}^{2} = \frac{154 \times 7}{4 \times 22} \\ \\ {r}^{2} = 12.25 \\ \\ r = \sqrt{12.25} \\ r = 3.5$
Therefore, Radius is 3.5 cm.

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