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d1=10
P=d*d1/2
P=4*10/2
P=20 [j²]
a²=(1/2 d)² +(1/2 d1)²
a²=2²+5² =4+25=29
a=√29
O=4a
O=4√29 [j]
P=
P=
P=20[j]²
2²+5²=c²
4+25=29
c²=29
c=
Pole to 20[j]², a obwód to [j].
Proszę :)