Therefore, the length of a big rectangle is 1/2+ width = 40 ÷ 2 = 20cm-( 1).
F is to fold the width in half and cut it into two small rectangles. The circumference of a small rectangle is (the length of a large rectangle+the width of 65438 +0/2)×2.
Therefore, the length of the big rectangle+the width of the big rectangle 1/2 = 50 ÷ 2 = 25 cm-(2).
Add (1) and (2) to the left, and add right to the right to get it.
A large rectangle with length ×3/2+ width ×3/2=45CM.
Length+width = 30 cm
The circumference of the rectangle is 30×2=60 (cm).