Question

In a hollow cylinder, the sum of the external and internal radii is 14 cm and the width is 4cm. If its height is 20 cm, the volume of the material in i is ________

1. 560 π cm3

2. 1120 π cm3

3. 56 π cm3

4. 360 π cm3​

Answer 1

Answer:3520cm^3
Step-by-step explanation:
Take external radiias x and internal radii as y
it is given that, x+y= 14
x-y=4
solving both the equations u get x=9cm and y=5 cm
Volume of hollow cylinder =π(R^2-r^2)h
22/7 *(81-25)*20
=3520 cm^3
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Answer 2

Answer:

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