Question

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​

Answer 1

Your answer was in the attached pictures

Answer 2

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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