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A bowl is in the shape of a hemisphere with a diameter of 16 cm - HSC - SSCE Mathematics Standard - Question 16 - 2019 - Paper 1

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A bowl is in the shape of a hemisphere with a diameter of 16 cm. What is the volume of the bowl, correct to the nearest cubic centimetre?

Worked Solution & Example Answer:A bowl is in the shape of a hemisphere with a diameter of 16 cm - HSC - SSCE Mathematics Standard - Question 16 - 2019 - Paper 1

Step 1

Find the radius of the hemisphere

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Answer

The radius of the hemisphere can be calculated by dividing the diameter by 2. Thus, the radius is:

r=d2=16 cm2=8 cmr = \frac{d}{2} = \frac{16\text{ cm}}{2} = 8\text{ cm}

Step 2

Calculate the volume using the hemisphere formula

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Answer

The volume of a hemisphere is given by the formula:

V=12×43πr3V = \frac{1}{2} \times \frac{4}{3} \pi r^3

Substituting the value of the radius into the formula:

V=12×43π(8)3V = \frac{1}{2} \times \frac{4}{3} \pi (8)^3

Calculating this gives:

V=46π(512)=20486π1072 cm3V = \frac{4}{6} \pi (512) = \frac{2048}{6} \pi \approx 1072\text{ cm}^3

Therefore, the volume of the bowl, correct to the nearest cubic centimetre, is 1072 cm³.

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