Explicație pas cu pas:
AB + AC + BC = 48
AC + BC = 48 - 20
AC + BC = 28
4AC = 3BC
AC = 3BC/4
3BC/4 + BC = 28
3BC/4 + 4BC/4 = 28
7BC/4 = 28
BC = 4*28/7 = 16 cm
AC = 28 - BC = 28 - 16 = 12 cm
_________
AB = 20 cm
AC = 12 cm
BC = 16 cm
P = 48 cm
p = P : 2 = 48 : 2 = 24 cm
A = √24(24 - 20)(24 - 12)(24 - 16) = √24*4*12*8 = √9216 = 96 cm^2
