P1 to równoległobok
P1 = ah = 2*5 = 10
P2 to trójkąt
P2 = 1/2 ah = 1/2 *2*3 = 3
P3 to trapez
P3 = 1/2 (a+b) h = 1/2 (3+2) 6 = 1/2 *5*6 =15
