Question

Find the
radius of the spher whose
surface area is 154cm2 .answer fast pleaseee

Answer 1

Answer:

surface area=4πr²

154=4×22/7 r²

154×7/22×4=r²

77×7/11×4=r²

7×7/4=r²

49/4=r²

r=√49/4=7/2

Answer 2

Given :

• Surface Area of Sphere is 154 cm² .

To Find :

• Radius of Sphere .

Solution :

For Radius :

Using Formula :

$\longmapsto\tt\boxed{Surface\:Area\:of\:Sphere=4\pi{{r}^{2}}}$

Putting Values :

$\longmapsto\tt{154=4\times\dfrac{22}{7}\times{{r}^{2}}}$

$\longmapsto\tt{154\times{7}=88{r}^{2}}$

$\longmapsto\tt{1078=88{r}^{2}}$

$\longmapsto\tt{\cancel\dfrac{1078}{88}={r}^{2}}$

$\longmapsto\tt{\sqrt{12.25}=r}$

$\longmapsto\tt\bf{3.5=r}$

So , The Radius of Sphere is 3.5 cm ...

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• Surface Area of Sphere = 4πr²
• Volume of Sphere = 4/3 πr³
• C.S.A of Hemisphere = 2πr²
• T.S.A of Hemisphere = 3πr²
• Volume of Hemisphere = 2/3 πr³

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