What is planar symmetry?

Planar symmetry is a type of symmetry that exists between two sides of an object when they are mirror images of each other along a plane. The plane of symmetry is an imaginary line that divides the object into two equal parts that are reflections of each other. This type of symmetry is common in two-dimensional objects, such as shapes and patterns, but also exists in three-dimensional objects like buildings, furniture, and even organic molecules. Planar symmetry can be used to create balance and harmony in designs and can also be used to identify certain properties of objects, such as chirality or handedness. Additionally, planar symmetry is often used in geometry and mathematics to solve problems related to symmetry and congruence.