Arectangular cornfield is 40 chains long and 18 chains wide how many acres are in the cornfield?

So it's basically asking for the area in the cornfield you would have to multiply the base times height or two sides of rectangle or square in this case it's 40 x 18

so there's 720 acres in the cornfield.

Just divide the x axis (the top) by 2 or multiply the y axis (the bottom) by 2