Odpowiedź :
a - 1,2 dm
b - 4 dm
h - 36 cm = 3,6 dm
P = (a+b)*h/2
P = (1,2+4)*3,6/2
P - (5,2*3,6)/2
P = 18,72/2
P = 9,36 dm^2
P = (a+b) * h/ 2
P = ( 4dm+ 1,2dm) * 3,6dm / 2 = 9,36 dm2
P = ( 4dm+ 1,2dm) * 3,6dm / 2 = 9,36 dm2