A,3x,B,5x,c,4x=Bila keliling segitiga ABC=60cm,Hitunglah luas Segitiga ABC

k = 60 cm

k = a + b + c
60 = 3x + 4x + 5x
60 = 12x
x = 5

a = 3x = 3 x 5 = 15
b = 4x = 4 x 5 = 15
c = 5x = 5 x 5 = 25

s = 1/2 keliling
s = 1/2 60
s = 30

Luas?

L = √ s (s-a) (s-b) (s-c)
L = √ 30 (30 -15) (30-20) (30-25)
L = √ 30 x 15 x 10 x 5
L = √ 22500
L = 150 cm²