Question

Panjang sebuah segitiga diketahui 2x cm,(2x-2) cm dan (3x+1) cm.jika keliling 27 cm maka sisi terpanjang adalah?

Answer 1

Kll = 2x + 2x - 2 + 3x +1
27 = 7x -1
7x = 27+ 1
7x = 28
x = 28/7
x = 4

sisi 1 = 2× = 2(4) = 8 cm
sisi 2 = 2× - 2 = 2(4) - 2 = 8 - 2 = 6 cm
sisi 3 = 3× + 1 = 3(4) + 1 = 12 + 1 = 13

sisi terpanjang 13 cm

Answer 2

Diket: segitiga
sisi a = 2x cm
sisi b = (2x-2) cm
Sisi c = (3x+1) cm
K = 27 cm
Dit: sisi terpanjang....?
jawab:
K = a + b + c
27 = 2x + (2x - 2) + (3x + 1)
27 = 2x + 2x - 2 + 3x + 1
27 = 2x +2x + 3x - 2 + 1
27 = 7x - 1
27 + 1 = 7x
28 = 7x
x = 28/7
x = 4
,
maka panjang sisi:
a  = 2x = 2. 4 = 8cm
b = 2x - 2 = 2.4 - 2 = 6cm
c = 3x + 1 = 3.4 + 1 = 13cm

sisi terpanjang sisi c = 13cm