A school organised a competition of making and decorating pen holder in the shape of 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
Answers
Given : pen holder in the shape of 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
To Find : how much cardboard does the school need if 30 students are participating in the competition
Solution:
radius = 3.5 cm
height = 10 cm
Base area = πR²
= (22/7)(3.5)²
= (22/7)(3.5)²
= 38.5 cm²
curved surface area = 2πRh
= 2(22/7)(3.5)10
= 220 cm²
cardboard required for one pen holder = 38.5 + 220
= 258.5 cm²
30 students are participating in the competition
Hence Total card board required = 30 * 258.5
= 7755 cm²
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Answer:
7755 cm² is your answer.