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Pp=a²
Pp=10² =100cm²
Pb=4PΔ
4PΔ=340-100=240 cm²
PΔ=240:4 =60cm²
PΔ=ah/2
h=2PΔ/a
h=2*60/10
h=12 cm
b - krawędz boczna
b²=h²+(1/2 a)²
b²=12²+5²=144+25 =169
b=√169
b=13cm dlugość krawędzi bocznej