Răspuns :
P = 2( AB + BC)
AB- LUNGIMEA
BC - LATIMEA
BC = AB/3
P= 2 ( AB + AB/3 ) - AMPLIFICAM PE AB CU 3
400/2 = 4AB /3
200 = 4AB/3
4AB= 200x3
4AB = 600
AB = 600/4
AB= 150
P = 2 ( AB + BC ) => 400 = 2 ( 150 + BC )
150 + BC = 200
BC = 200-150
BC = 50
AB- LUNGIMEA
BC - LATIMEA
BC = AB/3
P= 2 ( AB + AB/3 ) - AMPLIFICAM PE AB CU 3
400/2 = 4AB /3
200 = 4AB/3
4AB= 200x3
4AB = 600
AB = 600/4
AB= 150
P = 2 ( AB + BC ) => 400 = 2 ( 150 + BC )
150 + BC = 200
BC = 200-150
BC = 50
perimetrul= 2(l+L)=400⇒l+L=400:2=200
L=3l
3l+l=200
4l=200
l=200:4
l=50
L=3l
=3x50=150
deci
L=150
l=50
L=3l
3l+l=200
4l=200
l=200:4
l=50
L=3l
=3x50=150
deci
L=150
l=50