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P=40cm²
a=8cm
P=ah
h=
h=
h=5[cm]
Zadanie 2
a=m
b=m
P=ab
P=·=[m²]
L=2a+2b
L=2·+2·=+=+===2[m]
a=8cm
wzór: a*h=P
8*h=40/:8
h=5
2. P=a*b
3/4*1/3=1/4m2
Obw=2a+2b
Obw=2*3/4+2*1/3=13/6=2 1/6m