Find the surface area of a sphere of diameter:(i) 14 cm (ii) 21 cm (iii) 3.5 m
Question
Find the surface area of a sphere of diameter:(i) 14 cm (ii) 21 cm (iii) 3.5 m
Solution 1
The surface area of a sphere can be calculated using the formula 4πr², where r is the radius of the sphere. The radius is half of the diameter.
(i) For a sphere with a diameter of 14 cm, the radius is 14/2 = 7 cm. So, the surface area is 4π(7)² = 4π(49) = 196π cm².
(ii) For a sphere with a diameter of 21 cm, the radius is 21/2 = 10.5
Solution 2
The surface area of a sphere can be calculated using the formula 4πr², where r is the radius of the sphere.
(i) For a sphere with
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