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Diketahui:
Sisi AB = BC = (3x+1)cm,
Sisi AC = (2x-7)cm
Keliling = 35
Keliling = sisi1 + sisi2 + sisi3
35 = AB + BC + AC
35 = (3x+1) + (3x+1) + (2x-7)
35 = 3x + 1 + 3x + 1 + 2x - 7
35 = 8x - 5
8x - 5 = 35
8x = 35 + 5
8x = 40
x = 5
Panjang sisi-sisi segitiga:
AB = BC;
(3x + 1)cm
= (3(5) + 1)cm
= (15 + 1)cm
= 16 cm
AC;
(2x-7)cm
= (2(5) - 7)cm
= (10 - 7)cm
= 3 cm