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h=4,5
1/3 h=1,5cm
a²+b²=c²
1,5²(1/3 wysokosci jakby co)+b²=3²(promien)
2,25+b²=9
b²=6,75
b≈2,6
b=1/2 podstawy
a=5,2
Obw=3a=3 razy 5,2=15,6