I think I posted it in a wrong forum, being a newbie here and needs some help on my math problem. Thanks for all the help guys.

Hi I'm stuck with my homework for solid of revolution and surface area of this figure Trapezoid with slope of -5/L. R2 = 2L and R1 = 3L/2. ANy help is appreciated.

/ ----- |---------\

/ -----| ---------\ slope = -5/L

/_____|____|__\

...............3L/2 ...2L

a. Find the equation in terms of L (vol and surface area)

b. Vol as function of L

c. Value of L that minimizes the volume

d. Minimum Volume