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h=a+2
24=1/2*a*(a+2)
24=1/2a^2+a
1/2a^2+a-24=0
Δ=1-4*(1/2)*(-24)=1+48=49
=7
a1=-1+7=6
a2=-1-7=-8 -> sprzeczne
h=a+2=6+2=8
Z tw Pitagorasa obliczamy 3 bok:
8^2+6^2=c^2
64+36=c^2
c^2=100
c=10
Obwód=8+6+10=24