A school organised a competition of making and decorating pen holders in the shape of a cylinder by making its base and its curved surface area with cardboard. Each pen holder is supposed to have a radius of 3.5 cm and height 10 cm. How much cardboard does the school need if 30 students are participating in the competition?
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Answer:
Step-by-step explanation:
radius = 3.5cm
height = 10
students participating = 30
area of 1 pen holder = 2×πrh+πrr
=2 × 22 ÷ 7 × 3.5 × 3.5 × 10 +
22 ÷ 7 × 3.5 × 3.5
=258.5cm
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