I was simply doing it without trig. I just broke it up into rectangles and triangles. Area of a rectangle is base x height and area of a triangle is 1/2 x base x height. Then multiply the total area by the height of the tank to give the total volume of the tank.
The only reason I didn't discus similar triangles is because not everybody would know what I was talking about. I just figured out the area of each of the triangles separately and added them together. Yes, I could have just done 18x25=450sq in and got the same answer, but I wanted to make sure the OP understood where I got my measurements so that they could see I wasn't just guessing at what I was doing.
The only reason I didn't discus similar triangles is because not everybody would know what I was talking about. I just figured out the area of each of the triangles separately and added them together. Yes, I could have just done 18x25=450sq in and got the same answer, but I wanted to make sure the OP understood where I got my measurements so that they could see I wasn't just guessing at what I was doing.