Cut out the unit squares above. then, use them to make rectangles as you can with a perimeter of 10 centimeters. estimate to draw your rectangles below. Laval the side lenthes of each rectangle.

Generally, if a unit square is 1 x 1 (1 square unit), you can draw the following rectangles to get a perimeter of 10 centimeters:

1 square height, 4 squares width

2 squares height, 3 squares width

3 squares height, 2 squares width

4 squares height, 1 square width