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2014-09-23T22:34:38+03:00
L = l+5m
P = 50 m
P = 2L + 2l
50 = 2(l+5) + 2 l
50 = 2l+10+2l
50 = 4l+10
4l = 50-10
4l = 40
l = 40:4
l=10m

L=10m+5m
L=15m

A=Lxl
A=15x10
A=150m²
15 4 15