Question

A rectangular pice of paper 10cm x 4cm is fooded with out overlaping to make cylinder of height 4cm.Find volume of the cylinder ?​

Answer 1

Answer:

Length of rectangle paper =11cm

Breath - - - - - - - - - - - - - - - =4cm

So circumference of circular part of cylinder =2 pi r

So it is equal to length of paper (paper folded in shape of cylinder)

7=2 pi r

r=7/2 pi

R=1.11cm

Volume of cylinder = pi r² h

H=4cm

R=1.11cm

Volume = 3.14x(1.11)²x4=15.48cm³

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Answer 2

rectangle:

length=10cm

breadth=4cm

base of cylinder=length of rectangle

In cylinder:

height=4cm

radius =r

2*22/7*r=10

r=70/44

r=1.6

volume of cylinder=22/7*r²h

=22/7*1.6*1.6*4

=32.182 cm³