Question

A hollow garden roller,63 cm wide with a girth of 440 cm thick iron .find the volume of iron.

Answer 1

Circumference of girth of roller = 440 cm

2*Pi*R = 440 = R (220*7/22) = 70 cm

Outer radius = 70 cm & inner radius = 70-4 cm = 66 cm

Therefore Volume or iron = Pi [(70^2 - 60^2)]*63

= 58752 cm^3

Answer 2

Answer:

Let outer radius be R and inner radius be r.

B.T.Q

2piR = 440

=> (2×22×R)/7 = 440

thus, R= 70 cm

r=70-4

= 66 cm

Volume = pi (R^2-r^2) h

= 22/7 × 4×136×63

= 107712 $cm {}^{3}$