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Ob=70
Ob=175%H
70=1,75H
H=40
Ob=2a+2b
70=2a+2b
Pb=2aH+2bH
Pb=H(2a+2b)
Pb=H*Ob
Pb=40*70
Pb=2800cm²
x-100%
x=70cm*100%/175%
x=40cm
Obojętnie jakie przyjmiemy boki podstawy, ważne by obwód się zgadzał, więc a=30, b=5, bo L=2*(a+b), L=2*(30+5)=2*35=70(cm)
Pb=2*(40cm*30cm)+2*(40cm*5cm)
Pb=2*1200cm²+2*200cm²
Pb=2400cm²+400cm²
Pb=2800cm²