Question

What is total surface area of hemisphere with base radius 7cm​

Answer 1

TSA of hemisphere = 3πr²

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 3 \times \frac{22}{7} \times 7 \times 7$

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: =3 \times 22 \times 7$

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 66 \times 7$

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 462cm$

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Answer 2

Solution

Given :-

• Base radius of hemisphere = 7 cm

Find :-

• Total surface area of hemisphere

Explanation

Using Formula

★Total surface area of hemisphere = 3πr²

Keep value of base radius

➡ Total surface area of hemisphere = 3 × 22/7 × 7²

➡Total surface area of hemisphere = 3×22×7

➡Total surface area of hemisphere = 462 cm2

Hence

• Total surface area of hemisphere = 462 cm2

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