Question

radius of a sphere is 3.5cm then find it's surface area and volume

Answer 1

hello users ....

we have given that :-
Radius of a sphere is 3.5cm

we have to find :
surface area and volume of sphere =?

solution:-
we know that :
surface area of sphere = 4 πr²
and 
volume of sphere = 4/3 ×πr³

now,
surface area = 4 π (3.5)²
= 4 × 3.14 × 12.25 
= 12.56 × 12.25
= 153.86 cm² 

and 
volume = 4/3×π×(3.5)³ 
= 4/3 × 3.14 × 42.875 
= 4/3 × 134.6275
= 538.51 / 3
= 179.5 cm³ answer 

✰✰ hope it helps ✰✰