Question

Find the surface area and total surface area of a hemisphere of radius 21cm

Answer 1

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pls mark as braimllest

Answer 2

Answer:

$Surface\: Area \: of\:the \: Hemisphere = 2772 cm^{2}$

$Total\:Surface\: Area \: of\:the \: Hemisphere=4158 cm^{2}$

Step-by-step explanation:

Let the radius of a hemisphere (r) = 21 cm

$\boxed {Surface\: Area \: of\:the \: Hemisphere =2\pi r^{2}}$

$=2\times \frac{22}{7}\times (21)^{2}\\=2772\:cm^{2}$

$\boxed {Total\:Surface\: Area \: of\:the \: Hemisphere =3\pi r^{2}}$

$=3\times \frac{22}{7}\times (21)^{2}\\=4158\:cm^{2}$

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