en.wikipedia.org/wiki/Congruence_(geometry)

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.

www.ixl.com/math/grade-2/identify-congruent-shapes

Fun math practice! Improve your skills with free problems in 'Identify congruent shapes' and thousands of other practice lessons.

www.ixl.com/math/grade-3/identify-congruent-shapes

Fun math practice! Improve your skills with free problems in 'Identify congruent shapes' and thousands of other practice lessons.

www.basic-mathematics.com/congruent-shapes.html

This lesson about congruent shapes will teach you to recognize quicky when two shapes are congruent.

www.mathsisfun.com/geometry/congruent.html

Congruent or Similar? The two shapes need to be the same size to be congruent. When we need to resize one shape to make it the same as the other, the ...

jr.brainpop.com/math/geometry/congruentandsimilarshapes

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www.bbc.co.uk/schools/gcsebitesize/maths/geometry/congruencysimilarityrev3.shtml

A secondary school revision resource for GCSE Maths about foundation level congruent and similar shapes.

www.khanacademy.org/math/basic-geo/basic-geo-transformations-congruence/basic-geo-transformations-properties/v/testing-congruence-by-transformations-example

Sal shows that a given pair of pentagons are congruent by mapping one onto the other using rigid transformations.