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This is an equilateral triangles ( all 3 sides are equal in length).

Therefore  2x + 5 = 11

2x = 11 - 5 = 6

x = 6/2

x = 3

This is based on The equilateral theorem.

1)is not similar since corresponding sides are not in the same ratio

2)are similar since corresponding sides are in the same ratio and corresponding angles are equal

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