Question

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

Answer 1

Answer:

R+r=14

R-r=4

solving, R = 9 and r=5

Volume=πh (R+r) t

22/7x20 (9+5)x4

3520cm3

Answer 2

Answer:

blablabla

Step-by-step explanation: