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What is the volume of a hemisphere with a radius of 3.6 cm, rounded to the nearest tenth of a cubic centimeter?

Question

What is the volume of a hemisphere with a radius of 3.6 cm, rounded to the nearest tenth of a cubic centimeter?

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Solution

To find the volume of a hemisphere, we use the formula for the volume of a sphere and then divide by 2, since a hemisphere is half of a sphere. The formula for the volume of a sphere is:

V=43πr3 V = \frac{4}{3} \pi r^3

Given that the radius r r is 3.6 cm, we first calculate the volume of the sphere:

V=43π(3.6)3 V = \frac{4}{3} \pi (3.6)^3

First, calculate (3.6)3 (3.6)^3 :

3.6×3.6=12.96 3.6 \times 3.6 = 12.96 12.96×3.6=46.656 12.96 \times 3.6 = 46.656

So,

V=43π×46.656 V = \frac{4}{3} \pi \times 46.656

Next, multiply 43 \frac{4}{3} by 46.656:

43×46.656=62.208 \frac{4}{3} \times 46.656 = 62.208

Thus,

V=62.208π V = 62.208 \pi

Now, to find the volume of the hemisphere, we divide this result by 2:

Vhemisphere=62.208π2=31.104π V_{\text{hemisphere}} = \frac{62.208 \pi}{2} = 31.104 \pi

Finally, we approximate π \pi as 3.14 and calculate:

Vhemisphere31.104×3.14=97.26816 V_{\text{hemisphere}} \approx 31.104 \times 3.14 = 97.26816

Rounded to the nearest tenth, the volume of the hemisphere is:

97.3cubic centimeters 97.3 \, \text{cubic centimeters}

This problem has been solved

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