Răspuns :
P = 20 cm
L = 8 cm
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l = ?
P = 2 ( L + l )
P = 2 ( 8 + l )
16 + 2 l = 20
2 l = 4
l = 2 cm
L = 8 cm
-------------------
l = ?
P = 2 ( L + l )
P = 2 ( 8 + l )
16 + 2 l = 20
2 l = 4
l = 2 cm