Hello ceceeee1) The volume of the trough is its cross-sectional area multiplied by its length. So that's:2) If the semi-axes of an ellipse are of lengths and , then its area is . The width of this trough is cm; so . The area of a whole ellipse would be . So if the depth of the trough (which is half the length of the other axis) is , then:litres

So the depth of the trough is cm.

Grandad