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2014-11-14T09:41:13+02:00
Cel mai inteligent răspuns!
2014-11-14T09:48:52+02:00
L=12 cm
l= \frac{3}{4}  L

l= \frac{3L}{4}  \frac{3X12}{4}  \frac{36}{4} = 9
P=2(L+l)
P=2(12+9)
P=2x21
P=42cm

A=Lxl
A=12x9
A=108cm^2
5 4 5