The length of the fence of a trapezium-shaped field ABCD is 130m and side AB is perpendicular to each of the parallel sides AD and Bc.if BC=54m,CD=19m and AD=42m,find the area of the field.
The only missing side is AB
AB + 54 + 19 + 42 = 130
AB = 15
That's the height. So area
a = 15 * (54+52)/2