Răspuns :
P=52=2L+2l si l=0.3L
52=2L+2x0,3L
52=2L+0,6L
52=2,6L
L=20 cm
l=6 cm
A=20x6=120cm²
52=2L+2x0,3L
52=2L+0,6L
52=2,6L
L=20 cm
l=6 cm
A=20x6=120cm²
P = 2(L+l) ⇔ 52 cm =2*[L+ (30/100*L] |*10
260 = 10*L +3*L
L= 20 cm
=> l = 30*20/100=6 cm
A = L * l = 20cm*6cm =120 cm²
260 = 10*L +3*L
L= 20 cm
=> l = 30*20/100=6 cm
A = L * l = 20cm*6cm =120 cm²