2x + 6 + 6x - 4 + 3x + 13 = 180° (karena menjadi 1 garis)
(2x + 6x + 3x) + (6-4+13)
11x + 15 = 180°
11x = 180 - 15
11x = 165
x = 165 ÷ 11
x= 15 (B)
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2x + 6 + 6x - 4 + 3x + 13 = 180° (karena menjadi 1 garis)
(2x + 6x + 3x) + (6-4+13)
11x + 15 = 180°
11x = 180 - 15
11x = 165
x = 165 ÷ 11
x= 15 (B)