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Grade: 12th pass

                        

2. Find the surface area of a sphere of diameter: (i) 14 cm (ii) 21 cm (iii) 3.5 m

2. Find the surface area of a sphere of diameter:
(i) 14 cm (ii) 21 cm (iii) 3.5 m

one month ago

Answers : (1)

Pawan Prajapati
askIITians Faculty
5036 Points
							(i) Diameter (d) = 14 cm 
14 
Radius (r) = = 7 cm 
Now, surface area of the sphere = 4xr2 


192 


= 4 x 

22 
7 x 7 x 7 = 4 x .22 x 7 = 616cm2. 

(ii) Diameter (cl) = 21 cm 
:. Radius (r) = 21 cm 
2 
Now, surface area of the sphere = 4nr2 
22 21 21 
= 4 x x x = 1386 cm 
(iii) Diameter (d) = 3.5 m 
. 3.5 7 
:. Radius (r) m = m 

Now, surface area of the sphere = 4nr2 
22 7 7 22x 7 2 
= 4 x 7 x 4 x 4 = 4- = 38.5 m • 

						
one month ago
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