a) a*h / 2 = 8 * 3,5 / 2 = 28 / 2 = 14
b) a * h / 2 = 9 * 12 / 2 = 108 / 2 = 54
c) a * a = 4,5 * 4,5 = 20,25
d) a * b = 4 * 6,75 = 27
e) a * h = 3 * 8 = 24
f) e * f / 2 = 12 * 16 / 2 = 192 / 2 = 96
g) e * f / 2 = 8 * 14 / 2 = 112 / 2 = 66
h) (a + b) * h / 2 = (4 + 12,5) * 6 / 2 = 16,5 * 6 / 2 = 99 / 2 = 49,5
