The radius of a hemispherical balloon increases from 6 cm to 12 cm as air is being pumped into it. find the ratios of the surface areas of the balloon in two cases and also find the increased in their volume in percentage.
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Step-by-step explanation:
Total surface area of a Hemisphere =2πr
2
+πr
2
=3πr
2
r=6,Surface area=3π(6)
2
=36
r=12,Surface area=3π(12)
2
=144
Ratio = 36:144
=1:4
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