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h/2 = (xy+y²)/(x+y)
h = 2(xy + y²) / (x+y)
P=(a+b)h:2
a=x
b=y
P=xy+y²=y(x+y)
y(x+y)=(x+y)h:2
2y(x+y)=h(x+y)
h=2y
wysokość to 2y
(x+y)h/2 = (x+y)*y /(x+y)
h/2 =y
h = 2y