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124 cm = (5x-10) + (3x - 10) + 4x
= 5x - 10 + 3x - 10 + 4x
= 12x - 20
124 + 20 = 12x
144 = 12x
12 = x
Sisi 1 = (5x - 10)
= 5.12 - 10
= 50 cm
Sisi 2 = 3x - 10
= 3.12 - 10
= 26 cm
Sisi 3 = 4x
= 4.12
= 48 cm
Jadi sisi terpanjang adalah sisi 1 :)
124 = (5x -10) +(3x -10) +4x
124 = 12x -20
124 +20 = 12x
144 = 12x
x = 144/12
x = 12
a = 5x -10
a = 5(12) -10
a = 60 -10
a = 50 cm
b = 3x -10
b = 3(12) -10
b = 36 -10
b = 26 cm
c = 4x
c = 4(12)
c = 48 cm
Jadi, sisi terpanjang segitiga tersebut adalah 50 cm.