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α=60⁰
H=15 cm
a=15√3 cm
Pc=2a²+4aH
Pc=2*(15√3)²+4*15√3*15
Pc=2*675+4*225√3
Pc=1350+900*1,73
Pc≈2907 cm²
papier: 0,25m²=2500 cm²
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