1. Find the surface area of a sphere of radius:
(1)10.5 cm
(2) 5.6 cm
(3)14cm
2. Find the surface area of a sphere of diameter:
(1) 21 cm
(2)14 cm
(3) 3.5 m
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1 - Find the surface area of sphere of radius :-
1) Sol) :- r = 10.5cm
Surface area = 4πr²
= 4×22/7×(10.5)²
= 1386cm²
2) Sol) :- r = 5.6 cm
Surface area = 4πr²
= 4× 22/7×(5.6)²
= 394.24 cm²
3) Sol):- r = 14 cm
Surface area = 4πr²
= 4×22/7×(14)²
= 2464 cm²
2 - Find the surface area of a sphere of diameter :-
1 Sol):- Diameter = 14 cm
Radius = 14/2 = 7cm
Surface area = 4πr²
= 4×22/7×(7)²
= 616 cm²
2 Sol):- Diameter = 21 cm
Radius = 21/2 cm
Surface area = 4πr²
= 4×22/7×(21/2)²
= 1386 cm²
3) Sol):- Diameter = 3.5m
Radius = 3.5/2 = 1.75m
Surface area = 4πr²
= 4×22/7×(1.75)²
= 38.5 m²
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