Răspuns :
prima latura = 80 cm/4 = 20 cm
a doua latura = 20 cm + 19 cm = 39 cm
a treia latura = 80cm - (20cm + 39cm) = 21 cm
AB+Ac+BC=80cm
AB=AB+AC+BC/4=80/4=20
AB=20cm
AC=AB+19
AC=39 cm
BC=80-59
BC=21cm
prima latura = 80 cm/4 = 20 cm
a doua latura = 20 cm + 19 cm = 39 cm
a treia latura = 80cm - (20cm + 39cm) = 21 cm
AB+Ac+BC=80cm
AB=AB+AC+BC/4=80/4=20
AB=20cm
AC=AB+19
AC=39 cm
BC=80-59
BC=21cm