(80+50)/2*50=3250
versus
25*50+30*50=2750
so no they are not the same. i can't think of any particular reason why they are not equal though. and there's the added difficulty of it gumming the whole rest of the problem up :(
I am assuming that I am setting this up incorrectly or substituting the incorrect values.
A water trough is 10 m long and a cross-section has the shape
of an isosceles trapezoid that is 30 cm wide at the bottom,
80 cm wide at the top, and has height 50 cm. If the trough is
being filled with...