Explanation:
Need to find the other leg of the right triangle using pythagorean theorem
145^2 = 87^2 + x ^2
x= 116 u
SO the veg garden is a trapezoid with bases 140 and (116+ 140 = 256) and height 87 units
area = height + (base 1 + base 2) /2 = 87 * ( 140 + 256) /2 = 17 226 units^2