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Răspuns :

Teodoraalbei
fie a, b, c, d, laturile unui patrulater convex
P=a+b+c+d
1100=a+b+c+d
a/15=b/25=c/30=d/40=k
a/15=k⇒a=15k
b/25=k⇒b=25k
c/30=k⇒c=30k
d/40=k⇒d=40k
1100=15k+25k+30k+40k
1100=110k
k=10
a=15·10=150
b=25·10=250
c=30·10=300
d=40·10=400

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