Answer:
3392.9
Explanation:
A little Pythagoras first, just to show how it works:
In a right-angled triangle, a ² + b ² = c ²
41² = radius² + 40²
radius = 9
Volume of cone = (1/3) X vertical height X π r ²
= (1/3) (40) π (9) ²
= 1080π
= 3392.9 to nearest tenth