Răspuns :
P = a+b+c =2a + c = 48 cm
ma(a,c) = (a+c)/2 = 17 => a+c = 17x2 =>a+c=34
(2a+c)-(a+c) = 48-34
<=> 2a+c-a-c = 14 => a = 14 cm ; b= 14 cm ; c = 20 cm
Suma laturilor congruente = 14+14 = 28 cm
P=AB+BC+AC=48
(AB+BC)/2=17 => AB+BC=34
Daca P=48 cm si P=AB+BC+AC => 48=AB+BC+AC => 48=34+AC =>AC=14 => AB+AC=28