Question

find curved surfaces area and total surface area of hemispheres of diameter 10cm . take- 3.142​

Answer 1

Question:Find curved surfaces area and total surface area of hemispheres of diameter 10cm.

Given,

The diameter of hemisphere is 10cm.

Value of pie = 3.142

To find out,

The curved surface area and total surface area.

According to the question,

$formula \: for \: curved \: surface \: area \: of \: hemisphere \: = \frac{2}{3}\pi {r}^{2}$

As it is given, diameter = 10cm

then, the radius = 10/2 = 5cm

$= 2 \times 3.142 \times {5}^{2}$

$= 2 \times 3.142 \times 5 \times 5$

$= 6.284 \times 25$

$157.1 {cm}^{2}$

Therefore the curved surface area of the hemisphere is 157.1cm^2.

$formula \: for \: total \: surface \: area \: of \: hemisphere \: is \: 3\pi \: r$

$= 3 \times 3.142 \times 5$

$= 6.284 \times 5$

$= 31.42 {cm}^{2}$

Therefore the total surface area of hemisphere is 31.42cm^2.