Answer:
Step-by-step explanation:Answer: k = 19
because (6k+31)° is the outer angle of the triangle
=> (6k+31)° = (3k - 12)° + (6k - 14)°
⇔ 6k + 31 = 9k - 26
⇔ 9k - 6k = 31 + 26
⇔ 3k = 57
⇔ k = 57/3 = 19
Explanation:
Answer: k = 19
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