A Trough Whose Cross-Section Is a Right Isosceles Triangle Whose $500$

Multiple Choice

A trough whose cross-section is a right isosceles triangle whose base is 6 feet long and altitude is 6 feet long is filled with water of density 62.5 pounds per cubic foot. The force, in pounds, due to hydrostatic pressure on one end of the trough is

A) $500$
B) $\frac { 2,000 } { 3 }$
C) $1,250$
D) $1,850$
E) $2,250$