Answer:
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
