Question

please answer this question ​

Answer 1

Step-by-step explanation:

$total \: surface \: area \\ \: of \: the \: hemisphere \: = \\ 2\pi r^{2} \\ 462 = 3\pi \: r ^{2} \\ r \: = 7cm \\ volume \: of \: hemisphere = \frac{2}{3}\pi \: r{2} \\ v = \frac{2}{3} \times \frac{22}{7} \times 7 ^{3} \\ \ \\ v = 718.67cm ^{2}$

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Answer 2

Total surface area of the hemisphere =462cm²

3πr² = 462

3 × 22 × r² = 462

7

r² = 462 × 7

3 × 22

r² = 49

r = √49

r = 7

Now, Volume of hemisphere = 2 πr²

3

V = 2 × 22 × 7 × 7 × 7

3 7

= 2156 cm³

3

= 718.67 cm³