Answer:
B
Explanation:
triangle ABC is an isosceles triangle since there are two equal angles
hence,
AB = BC
4x = 2x + 6
4x - 2x - 6 = 0
2x - 6 = 0
2x = 6
x = 3
AB = 4x
AB = 4 * 3
AB = 12
ITS B
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