CD =48cm ; tg B =4/3
tg B =AC/AB =4/3 => AC =4AB/3
tg B =AD/DB => 4/3=AD/DB ; AD =4DB/3
AD^2 =CD*BD ; ( 4DB/3)^2 =48*DB ; 16DB^2/9 =48DB
16DB/9 =48 ; DB =9*48/16 =27 cm
BC =48+27 =75 cm
AB^2 =BD*BC ; AB^2 =27*75 =2025
AB =45 cm
AC=4AB/3 =4*45/3 =60 cm
P =45+60+75 =180 cm