Odpowiedź:
P = 1/2 (a + b) • h
a = 2 + 4 = 6
b = 4 - 2 = 2
h = 4
P = 1/2 (6 + 2) • 4
P = 1/2 • 8 • 4
P = 4 • 4
P = 16 [j²]