The total surface area of a solid hemisphere is 462 cm $^{2}$ . Find its radius.

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Solution

Let $r$ be radius of solid hemisphere.
Total surface area of solid hemisphere $= 3 π r^{2}$
It is given that total surface area is 462 cm $^{2}$
$\Rightarrow 3 π r^{2} = 462$
$\Rightarrow π r^{2} = 154$
$\Rightarrow r^{2} = 154 \times \frac{7}{22}$
$\Rightarrow r^{2} = 49$
$\Rightarrow r = 7$ cm

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The total surface area of a solid hemisphere is 462 cm2. Find its radius.

Let r be radius of solid hemisphere.Total surface area of solid hemisphere =3πr2It is given that total surface area is 462 cm2⇒3πr2=462⇒πr2=154⇒r2=154×722⇒r2=49⇒r=7 cm

The total surface area of a solid hemisphere is 462 cm $^{2}$ . Find its radius.

Let $r$ be radius of solid hemisphere.
Total surface area of solid hemisphere $= 3 π r^{2}$
It is given that total surface area is 462 cm $^{2}$
$\Rightarrow 3 π r^{2} = 462$
$\Rightarrow π r^{2} = 154$
$\Rightarrow r^{2} = 154 \times \frac{7}{22}$
$\Rightarrow r^{2} = 49$
$\Rightarrow r = 7$ cm