ΔABC sama sisi AB = AC, AB = (6x + 4) BC = (4x + 12) Keliling ΔABC adalah... *tolong dijawab pakai cara yg lengkap

Segitiga ABC sama sisi
AB = BC = AC
(6x +4) = ( 4x + 12)
6x - 4x = 12 -4
2x = 8
x = 8/2 = 4

AB = 6(4) +4 = 28 cm
BC = 4( 4) +12 = 28cm
AC = 28cm

Keliling ∆ ABC = AB +BC + AC
= 28 +28 +28 = 84 cm