19) A rectangular piece of paper of width 30 cm
and length 77 cm is rolled along its width, to
form a cylinder. What is the volume of the
cylinder so formed?
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Answer:-
- volume of cylinder formed is 14148.75cm³
step-by-step explaination:-
Given:-
- width of rectangular paper = 30cm.
- length = 77cm
length of rectangle = circumference of circle of cylinder
and width of rectangle = height of cylinder
so ,
- => 77 = 2πr
- => 77 × 22/7 × 2 = r
- 49/4 = r
now,
volume of cylinder = πr²h
=22/7 × 49/4 × 49/4 × 30
= 14148.75cm³
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