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0,5*10cm*d₂ = 120cm²
5cm*d₂ =120cm² |:5cm
d₂ = 24cm
a² = (10cm:2)²+(24cm:2)²
a² = (5cm)²+(12cm)²
a² = 25cm²+144cm²
a² = 169cm²
a = √169cm²
a = 13cm
Pc = 240cm²+4*20*13cm
Pc = 240cm²+80*13cm
Pc = 240cm²+1040cm²
Pc = 1280cm²