All of the angles between the sides need to be the same. The sides can be of any length, but because the angles are the same they will always be in the same ratio to each other.
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That their sides are congruent.
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Yes. If two figures are congruent, then you literally can't tell one from the other.Anything that's true of one is also true of the other.
An obtuse triangle must have two acute angles and these can be congruent.
Two figures are congruent if and only if they have the same shape and size.