Area 18 X 15 = 270 cm?

It becomes a parallelogram with a constant perimeter and a smaller area.

The area of a parallelogram depends on its height. Let's turn a rectangle into a parallelogram. The lower the height, the smaller the area.

If the length of a rectangle is used as the upper and lower bottoms,

Then s parallelogram =18 * H. This height H is up to you. How low you press it, H is how big it is.

PS: H can be pressed down from 15 cm until it overlaps up and down, and then becomes a line. 0 & lth & lt 15

If the width of a rectangle is used as the bottom,

Then s parallelogram = 15 * H, and again, this height h is up to you. How low you press it, how big it will be. PS:0 & lt； h & lt 18