Calculate the inner area (cross sectional) of a pipe with an outer diameter of 300mm and a

thickness of 5mm.

What length of pipe can be manufactured from 10^6 cm^3 material?

46.3 cm²

216 m

Explanation:

The cross sectional area is the area of the outer circle minus the area of the inner circle.

A = πR² - πr²

R = 300/2 = 150 mm = 15 cm

r = 150 - 5 = 145 mm = 14.5 cm

A = π (15 cm) ² - π (14.5 cm) ²

A ≈ 46.3 cm²

Volume is area times length:

V = AL

10⁶ cm³ = (46.3 cm²) L

L ≈ 21,580 cm

L ≈ 216 m