The formula for the area of a trapezoid is a=1/2h(a+b), where h represents the height and a and b represent the length of the bases. solve for h.

H=1/2(a+b) in order to solve for h to find the area

The greatest common factor (GCF) of 30, 48, and 60 is: 6

Factors for 30: 1, 2, 3, 5, 6, 10, 15, 30
Factors of 48: 1, 2, 3, 4, 6, 8, 12, 16, 24
Factors of 60: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30

The common factors between them are 1, 2, 3, and 6, but 6 is the greatest.