Question

the surface area of a sphere is 20m^2. find the surface area of the corresponding hemi sphere.
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Answer 1

Answer:

10m*2

Step-by-step explanation:

4pir*2=20cm*2

4×22/7×r*2=20cm*2

r*2=20×7/88

r*2=/35÷22

Answer 2

Answer ⤵️

Surface area of the sphere= 4πr²

20= 4πr²

${r}^{2} = 4\pi \times 20 \\ {r}^{2} = 4 \times \frac{22}{7} \times 20 \\ {r}^{2} = \frac{1760}{7} \\ {r}^{2} = 251.42 \\ r = \sqrt{251.42} \\ r = 15.85 \: \: \: \: m$

So the radii of the sphere is 15.85 m

So let's found out the surface area of the hemisphere.

Curved surface area= 2πr²

$2 \times \frac{22}{7} \times 15.85 \times 15.85 \\ = \frac{11}{7} \times 15.85 \times 15.85 \\ = \frac{2763.44}{7} \\ = 394.77 \: \: \: \: {m}^{2}$

So the surface area of the hemisphere is 394.77 m²

Step-by-step explanation:

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