If each tennis ball has a diameter of 7 cm, calculate the amount of material needed to make a can that holds 3 tennis balls.?
Answers
Matt
Area = 1/2 pi r² = 1/2 x 3.14 x 3.5² = 19.2 cm² Circumference = 2 pi r = pi x d = 3.14 x 7 = 21.2 cm. So you need a can that is 21.2 cm around and 3 x 7cm = 21 cm high, plus 2 end caps of 19.2 cm² so you have 21.2 cm x 21 cm + 2 x 19.2cm² = 483.6 m²
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