In this example the shapes are congruent, we only need to flip one over and move it a little. In this video, we find lines of symmetry in a 2D shape. The same shape and size (but we are allowed to flip, slide or turn). ![]() Lines of symmetry - Grade 3 Common Core Standards Use this immensely important concept to prove various geometric theorems about triangles and parallelograms. reflections and translations given two congruent figures. Learn what it means for two figures to be congruent, and how to determine whether two figures are congruent or not. A circle has an infinite number of lines of symmetry. G.2 - Congruency - Understand that a 2-dimensional figure is congruent to another if the. The more sides that a regular polygon has, the greater the number of lines of symmetry there are. Shapes may have multiple lines of symmetry and the lines of symmetry can be vertical, horizontal, or diagonal. For example, a transformation which changes the object's size is not a congruence transformation. Note that not all transformations are congruence transformations. The following Frayer Model gives a summary of symmetry for 2-D shapes. A congruence transformation is the movement or repositioning of a shape such that it produces a shape which is congruent to the original.
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