Question

Find the surface area of a sphere of radius:
(i) 10.5 cm
(ii) 5.6 cm
(iii) 14cm

Answer 1

i) r=10.5
csa of sphere= 4×22÷7×10.5×10.5
=1386
ii)r=5.6
csa of sphere = 4×22÷7×5.6×5.6
= 394.24
iii)r=14
csa of sphere=4×22÷7×14×14
=2464