What is the meaning of congruence? please tell fast

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Congruence means that both the objects which are to be compared are equal in all means like length of the sides, measure of each angle etc.
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In geometry, two figures or objects are congruent if they have the same shape and size, or if one has the same shape and size as the mirror image of the other. More formally, two sets of points are called congruent if, and only if, one can be transformed into the other by an isometry, i.e., a combination of rigid motions, namely a translation, a rotation, and a reflection
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