Question

Keliling segitiga ABC adalah 12 cm. jika ukuran panjang sisi AB = x cm, BC = (x + 1) cm, dan AC = (x + 2) cm, maka panjang sisi BC adalah... cm.

Answer 1

12 = x + x + 1 + x + 2
12 = 3x + 3
12 - 3 = 3x
9 = 3x
x = 3
Panjang sisi BC = (x + 1)
= (3 + 1)
= 4 cm

Answer 2

AB + BC + AC = 12
x + x + 1 + x + 2 = 12
3x + 3 = 12
3x = 12 - 3
3x = 9
x = 9/3
x = 3

panjang sisi BC = x + 1
= 3 + 1
= 4 cm