Hello,Originally Posted byabcting223hk

you have to cut sqares from the corners of the sheet of paper. I've attached a diagram to demonstrate what I've calculated.

Let be l = length of sheet, w = width of sheet. Then you get:

x must be lower then .5*w.

You'll get the maximum of V if the 1rst dervative of V with respect to x equals zero:

. Solve for x. You'll get 2 solutions, but the greater solution isn't very realistic.

. That will give approximately x = 4.04 cm.

Plug in w = 21 cm and l = 29,7 cm.

Greetings

EB