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1/2*(a+b)*h=1/2*(12+6)*4=1/2*72=36cmkwadratowych
16+y(do kwadratu)= 25
y(do kwadratu)= 9 |: na pierwiastek
y=3
obw=28
x=(28-5-5-3-3) : 2 =12:2=6
z=6+3+3=12
P trapezu= (a+b)*h /2 = (6+12)*4 /2= 18*4 /2=36
odp: Pole tego trapezu wynosi 36 cm kwadratowych.
:)