so, the garden is a 14x10 rectangle, meaning is has an area of 14*10 or 140 m².
now, if we just get the area of the triangular flower bed, and the trapezoidal vegetable patch, and "subtract" them from the garden's area, what's leftover is just the area of the lawn.
notice, the flower bed has a height of 8, and a base of 3.
the vegetable patch has parallel sides a = 7, b = 5 and a height of h = 10.
