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Learn what it means for two figures to be congruent, and how to determine whether two figures are congruent or not. Use this immensely important concept to prove various geometric theorems about triangles and parallelograms.
Learn what it means for two figures to be congruent, and how to determine whether two figures are congruent or not. Use this immensely important concept to prove various geometric theorems about triangles and parallelograms.
Explore geometry concepts including angles, shapes, transformations, and proofs with Khan Academy's engaging resources.
Two shapes are congruent if they have the same size and shape. When we use rigid transformations (translations, rotations, and reflections) to move a shape, it keeps the same size and shape. So if there is a series of...
If we can map one figure onto another using rigid transformations, they are congruent. They are still congruent if we need to use more than one transformation to map it. They aren't if we use a transformation that cha...
Learn high school geometry—transformations, congruence, similarity, trigonometry, analytic geometry, and more (aligned with Common Core standards).
The triangle congruence criteria give us a shorter way! With as few as 3 of the measurements, we can often show that two triangles are congruent. We can break up any polygon into triangles. So showing that triangles a...
What do congruent and similar mean? Congruent triangles have both the same shape and the same size. In the figure below, triangles A B C and D E F are congruent; they have the same angle measures and the same side lengths.
Congruence has nothing to do with the direction an object faces. Congruent shapes have the corresponding sides that are equal length and corresponding angles that are equal.
Explore geometry concepts such as lines, angles, and shapes with interactive lessons and exercises on Khan Academy.
