Answer:
9 x 7 = 63 <---- Parallelogram
10 x 6.8 = 68, 68 divided by 2 = 34 <------- Triangle
13 + 15 = 28, 28 x 6 = 168, 168 divided by 2 = 84 <------- Trapezoid
The trapezoid has the greatest area.
Formula of trapezoid:
B1(base 1) + B2(base 2) x H (height) x 1/2 (basically dividing by 2)
Formula of triangle:
B(base) x H(height) x 1/2 (basically dividing by 2)
Formula of Parallelogram:
B(base) x H(height)