Hello, meru!

The diagram shows a sheet of uniform thickness. An open envelope

is formed by folding along and by gluing and

Show that the distance of the centre of mass from is:Code:C B * - - - - - * | | * | | * - + - - o - - + -o- - -* - - | Q O| P * A | | * * - - - - - * F G

The area (mass) of is: .

The distance from its center of mass to the origin

. . is: .

Hence, its moment is: .

The center of mass of the square is at

Its mass is: .

Its moment is: .

The total moment is: .

The total mass is: .

Hence, the center of mass is at: .

It is units to the left of .