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Volume of a sphere
1) A hollow spherical metallic ball has an external diameter 6cm and is 1/2cm thick. The volume of metal used in the metal is:
1200cm³
1433cm³
1345cm³
1300cm³
1/10
Solution
Answer:
1433cm³
Explanation:
External radius = 3cm,
Internal radius = (3 - 0.5)cm = 2.5cm
Volume of sphere
= 4/3πr³
= 4/3 × 22/7 × [32 − 2.52]cm³
= 4/3 × 22/7 × 918cm³
= 1433cm³
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