Question

find the volume of a cylinder obtained by folding a rectangular sheet of paper of 21 into 7​

Answer 1

Step-by-step explanation:

Given Find the volume of a cylinder obtained by folding a rectangular sheet of paper of 21 into 7

• Given rectangular sheet of paper is folded to form a cylindrical shape.
• So length = 21 cm and breadth = 7 cm
• Therefore height will be h = 21 cm
• Circumference of the base of cylinder is 2 π r = 7 cm
•                                                               = 2 x 22 / 7 x r = 7
•                                                 Or r = 49 / 44
•                                                         = 1.11 cm
• Now volume of cylinder = π r^2 h
•                                         = 22/7 x (1.11)^2 x 21
•                                         = 22 x 1.11 x 1.11 x 3
•                                         = 81.31 cu cm

Therefore volume of the cylinder is 81.31 cu cm.

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