the diagram shows an open tank for storing water ABCDEF. The sides ABFE and CDEF are rectangles. The triangular ends ADE and BCF are isosceles, and angle AED = angle BFC = 90 degrees. The ends ADE and BCF are vertical and EF is horizontal. Given that AD = x metres: a) show that the area of triangle ADE is 1/4 x^2 m^2 Given also that the capacity of the container is 4000 m^3 and that the total area of the two triangular and two rectangular sides of the container is S m^2
