Question

15.The radius of a solid hemisphere is 7cm.Find its total curved surface area.​

Answer 1

Answer:

Surface area of the hemisphere =2πr ²

=308cm²

Answer 2

Radius of hemisphere = 7 cm

Now, we have to find out total curved surface area.

Total surface area = 2πr²

$\rm \implies A = 2\pi {r}^{2} \\ \\ \rm \implies A = 2 \times \dfrac{22}{7} \times {(7)}^{2}\\ \\ \rm \implies A = 2 \times \dfrac{22}{7} \times 7 \times 7\\ \\ \rm \implies A = 2 \times \dfrac{22}{1} \times 7 \\ \\ \rm \implies A = 308 \: {cm}^{2}$

Answer :

Total curved surface area = 308 cm²

Additional Information :

Volume of cylinder = πr²h

T.S.A of cylinder = 2πrh + 2πr²

Volume of cone = ⅓ πr²h

C.S.A of cone = πrl

T.S.A of cone = πrl + πr²

Volume of cuboid = l × b × h

C.S.A of cuboid = 2(l + b)h

T.S.A of cuboid = 2(lb + bh + lh)

C.S.A of cube = 4a²

T.S.A of cube = 6a²

Volume of cube = a³

Volume of sphere = (4/3)πr³

Surface area of sphere = 4πr²

Volume of hemisphere = ⅔ πr³

C.S.A of hemisphere = 2πr²

T.S.A of hemisphere = 3πr²