Math, asked by shreyas1349, 4 hours ago

Curved surface area of hemisphere whose radius is7 cm

Answers

Answered by Anonymous
2

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
Answered by Anonymous
73

ɢɪᴠᴇɴ :

  • The radius of hemisphere is 7 cm.

ᴛᴏ ғɪɴᴅ :

  • Find the curved surface area

\:\:\:\:\:\:\:\:\:\:\:\:\:\:━━━━━━━━━━━━━━━━━━

 \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}

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