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a=60dm
b=8cm=0,8dm
Szukane:
c=?
-----------------
c^= a^ +b^ (^--->oznacza do kwadratu)
c^= 60^ + 0,8^
c^= 3600+0,64
c^=3600,64
c= 60,01 dm
Obw= 60 +0,8 +60,01=120,81dm