latimea = L : 2 - 10
P = 10,05 u.m. ( unitatea de masura )
Perimetrul dreptunghiului = 2 × ( L + latimea ) = 10,05
10,05 : 2 = 5,025 → semiperimetrul = suma dintre lungime si latime
L + L/ 2 - 10 = 5,025
2 L + L = 2 × (5,025 + 10 )
3 L = 2 × 15,025
L =30,050 : 3
L = 10,016
latimea = 10,016 : 2 - 10 = 5,008 - 10 = - 5,008
