Given:
Scale of 4 cm : 25 feet
Rectangle with actual measurements of 750 feet and 500 feet.
750 feet / 25 feet = 30
30 4cm = 120 cm
500 feet / 25 feet = 20
20 4cm = 80 cm
The scale model of the playground should have a length of 120 cm and a width of 80 cm.