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1,2dm=12cm
9^2+12^2=15^2
81+144=225
225=225
L=P
2.(pierw z 7)^2+(pierw z 6)^2=(pierw z 13)^2
7+6=13
13=13
L=P
3.
1^2+(pierw z 2)^2=(pierw z 3)^2
1+2=3
3=3
L=P