Question

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

Answer 1

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

Answer 2

Answer:

Step-by-step explanation:

inner dimeter of roller = ext. diameter- 2(thickness)

=42- 2(2)= 38cm

volume = π/4(D²-d²)h

=π/4(42²-38²)158

= 38217.14cm³