TRUE
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Not always
Yes, in similar triangles, the angles are always congruent, and the sides have the same proportions to each other.
No, triangles with the same side lengths are always congruent.
No. All corresponding sides and angles have to be congruent for the triangles to be congruent.
You could prove two triangles are congruent by measuring each side of both triangles, and all three angles of each triangle. If the lengths of the sides are the same, and so are the angles, then the triangles are congruent... if not, then the triangles are not congruent. If the triangles have the exact same size and shape then they are congruent.