Q. 14.3( 220 Votes )

# Find the surface area of a sphere of radius:

(i) 10.5 cm (ii) 5.6 cm

(iii) 14 cm

Answer :

(i) Radius (r) of sphere = 10.5 cm

Surface area of sphere = 4πr^{2}

= 4 * * 10.5 * 10.5

= 88 * 1.5 * 10.5

= 1386 cm^{2}

(ii) Radius(r) of sphere = 5.6 cm

Surface area of sphere = 4πr^{2}

= 4 * * 5.6 * 5.6

= 88 * 0.8 * 5.6

= 394.24 cm^{2}

(iii) Radius (r) of sphere = 14 cm

Surface area of sphere = 4πr^{2}

= 4 * * 14 * 14

= 4 * 44 * 14

= 2464 cm^{2}

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