Question

Curved surface area of hemisphere whose radius is7 cm

Answer 1

Appropriate Question :

• Find the curved surface area of hemisphere whose radius is 7cm

Answer :

• Curved surface area of hemisphere is 308cm²

Given :

• Radius is 7cm

To find :

• Curved surface area of hemisphere

Solution :

Given

• Radius is 7cm

We know that

• Curved surface area of hemisphere = 2πr²

Where,

• r is radius

Substituting the value :

➠ CSA of hemisphere = 2πr²

➠ CSA of hemisphere = 2 × 22/7 × (7)²

➠ CSA of hemisphere = 2 × 22/7 × 49

➠ CSA of hemisphere = 2 × 22 × 7

➠ CSA of hemisphere = 44 × 7

➠ CSA of hemisphere = 308cm²

Hence,Curved surface area of hemisphere is 308cm²

More Explanation :

• Volume of hemisphere = 2/3 πr²
• Hemisphere = hemi means half and sphere means 3D shape

Answer 2

ɢɪᴠᴇɴ :

• The radius of hemisphere is 7 cm.

ᴛᴏ ғɪɴᴅ :

• Find the curved surface area

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$\sf{We \: know \: that,}$

$\begin{gathered} \sf \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: Curved \: surface \: area_{(hemisphere)} = 2\pi {r}^{2} \\ \\ \: \: \: \: \: \: \: \: \tt\therefore \:Csf = 2 \times \frac{22}{7} \times {(7)}^{2} \\ \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \tt: \implies \:Csf = \: 2 \times \frac{22}{7} \times 49 \\ \\ \: \: \: \: \: \: \: \: \: \:\tt : \implies \: Csf = 2 \times 22 \times 7 \\ \\ \: \: \: \: \: \underline{ \boxed{ \tt : \implies \: Csf = 308 \: {m}^{2} }} \\ \\ \:\:\:\:\:\:\:\:\:\:\:\:\:\:━━━━━━━━━━━━━━━━━━ \\ \\ \tt{ \therefore \underline{Hence, \: Final \: answer \: is \: 308 \: m²}}\end{gathered}$