The volume of a hemi-sphere is 2425\(\frac{1}2\) cm3 . Find its curve

1.	The volume of a hemi-sphere is 2425\(\frac{1}2\) cm3 . Find its curved surface area.[ use π = \(\frac{22}7\)].
Answer» Volume of hemi-sphere = \(\frac{2}3πr^3\) ⇒ \(\frac{2}3πr^3\) = 4851 ⇒ r³ = \(\frac{{4851}\times{3}\times{7}}{{22}\times{2}\times{2}}\) ⇒ r = 10.5 cm Curved surface area = 2πr² ^{= \(2\times\frac{22}7\times10.5^2\)} = 693 cm²

The volume of a hemi-sphere is 2425\(\frac{1}2\) cm3 . Find its curved surface area.[ use π = \(\frac{22}7\)].

Answer»

Volume of hemi-sphere = \(\frac{2}3πr^3\)

⇒ \(\frac{2}3πr^3\) = 4851

⇒ r³ = \(\frac{{4851}\times{3}\times{7}}{{22}\times{2}\times{2}}\)

⇒ r = 10.5 cm

Curved surface area = 2πr²

^{= \(2\times\frac{22}7\times10.5^2\)}

= 693 cm²