Question

find the total surface area of hemisphere of radius 10cm​

Answer 1

Radius of Hemisphere = 10 cm

Total Surface Area = 3πr²

= 3 × 314/100 × 10 × 10 (π = 3.14)

= 3 × 314

= 642 cm²

Hence

Total Surface Area = 642 cm²

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Answer 2

GIVEN:

• Radius of Hemisphere = 10 cm

TO FIND:

• What is the total surface area of hemisphere ?

SOLUTION:

We know that the formula for finding the total surface area of hemisphere is:-

$\large{\boxed{\bf{\star \: T.S.A. = 3 \pi r^2 \: \star}}}$

Take π = 22/7

• π = 22/7
• Radius (r) = 10 cm

According to question:-

$\sf{\longmapsto TSA = 3 \times \dfrac{22}{7} \times (10)^2 }$

$\sf{\longmapsto TSA = \dfrac{66}{7} \times 100 }$

$\sf{\longmapsto TSA = \cancel\dfrac{6600}{7} }$

$\bf{\longmapsto TSA = 942.85 \: cm^2 }$

❝ Hence, the Total surface area of hemisphere is 942.85 cm² ❞

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