- since the triangles are congruent, their side lengths and angles should be congruent.
- set them equal to each other.
3x - 5 = x + 6
2x - 5 = 6
2x = 11
x = 5.5
- now plug in.
AC = 3(5.5) - 5
AC = 11.5
so, option C.
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