Question

find the radius of a sphere whose surface area is 154 cm2

Answer 1

Answer:

Step-by-step explanation:

Given :-

Surface area of sphere = 154 m²

To Find :-

Radius of a sphere

Formula to be used :-

Surface area of sphere = 4πr²

Solution :-

Let 'r' be the radius of sphere

Surface area of sphere = 4πr²

⇒ 154 = 4πr²  

⇒ 154 = 4 x 22/7 x r²

⇒ r²  = 154 x 7/4 x 22 = 49/4

⇒ r = 7/2 cm  

⇒ r = 3.5 cm

Hence, the Radius of a sphere is 3.5 cm.

Answer 2

Answer:

$\huge\sf\pink{Answer:3.5}$

Given that :

• The radius of a sphere whose surface area is 152 cm2

To find :

• The radius of thr sphere.

$\huge\mathfrak{Solution:-}$

Let 'r' be the radius of sphere

 Surface area of sphere = 4πr2 

⇒ 154 = 4πr2 

⇒  154 = 4 x 22/7 x r2

⇒ r2  = 154 x 7/4 x 22 = 49/4

⇒ r = 7/2 cm   = 3.5 cm

$\huge\boxed{3.5cm2}$