Panjang sisi-sisi suatu segitiga adalah (3x + 1) cm, (4x + 2) cm dan (6x + 5) cm. Jika keliling segitiga tersebut 47 cm, maka sisi terpanjang adalah .... A 28

S1 = (3x + 1)
S2 = (4x +2)
S3 = (6x + 5)
K = 47

K = s1 + s2 + s3
47 = (3x + 1) + (4x + 2) + (6x + 5)
47 = 13x + 8
13x = 47 - 8
13x = 39
X = 39 : 13
X = 3

S1 = (3x + 1) = (3(3) + 1) = 10cm
S2 = (4x + 2) = (4(3) + 2) = 14cm
S3 = (6x + 5) = 6(3) + 5 = 23 cm

Sisi terpanjang = 23 cm