120 = 2^3*3*5

There are 5 total factors. At least 2 are needed to form a composite number. Possibilities are

2*2 by 2*3*5 ›› 4 ft by 30 ft

2*3 by 2*2*5 ›› 6 ft by 20 ft

2*5 by 2*2*3 ›› 10 ft by 12 ft

3*5 by 2*2*2 ›› 15 ft by 8 ft

There are 5 total factors. At least 2 are needed to form a composite number. Possibilities are

2*2 by 2*3*5 ›› 4 ft by 30 ft

2*3 by 2*2*5 ›› 6 ft by 20 ft

2*5 by 2*2*3 ›› 10 ft by 12 ft

3*5 by 2*2*2 ›› 15 ft by 8 ft