tolong di jawab ya..pke cara..

jmlh=3+4+5=12
b=4/12×72=24 cm b.

semoga membantu

perbandingan
a : b : c = 3 : 4 :5
maka,
K = s + s + s
72= 3× + 4× + 5×
72 = 12 ×
× = 72 : 12
× = 6

* panjang sisi
a = 3 × 6
= 18
b = 4 × 6
= 24
c =
5 × 6
= 30