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Pp=a²=10²=100
c=dł. krawedzi bocznej=1,3dm=13cm
k=wysokosc sciany bocznej
1/2a=5cm
z pitagorasa;
(1/2a)²+k²=c²
5²+k²=13²
k²=144
k=12cm
Pb=4*1/2ak=2*10*12=240
Pc=100+240=340cm²