Question

a hollow garden roller of 42 cm and diameter and length 152 cm is made of cast iron of 2 cm thick.Find the volume of the iron used in the roller?

Answer 1

roller is in cylinder shape so volume of cylinder is π×radius square ×height .22/7×21×21×152= 22/7×441×152=22/7×67032=22×9576=210672cm.cubes

Answer 2

Answer:

Step-by-step explanation:

radius = 21

volume = pie . 21.21. 152

Now cast iron 2 cm think

so radius of hollowed = 21-2 = 19

volume of hollowed = pie.19.19.152

so volume of iron used = pie .152 ( 21.21 - 19.19) = 3.14 × 152 × (441-361)

= 3.14×152×80

= 38182.4