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sehingga :
3x + 4x + 5x = 36 ------keliling segitiga--------
12x = 36
x =3
jadi sisi ke1 = 3x = 9
sisi ke2 = 4x = 12
sisi ke3 = 5x = 15
9 , 12 , 15 -----merupakan barisan aritmatika dengan beda 3---------
maka luas segitiga = 1/2 a.t
= 1/2 . 9 . 12
= 54 cm²
bisa ditanyakan apabila kurang jelas :)