Rotating the parallelogram 180° about its center maps the parallelogram back onto itself. The center of rotation is a point called the center of symmetry. Rotational symmetryĪ figure has rotational symmetry if rotating it about its center at a given angle maps the figure back onto itself. For example, the rectangular prism below has three planes of symmetry. Geometric solids can have multiple planes of symmetry. Plane of symmetryĪ plane of symmetry is a plane that cuts a 3D figure into equal halves such that the reflection of half of the object across the plane is the mirror image of the other half. This must be true for all points on the trapezoid for it to exhibit symmetry. The distance from each point shown on the trapezoid to the line of symmetry is equal to the distance from the reflected point to the line of symmetry the distance from A to D is equal to that from A' to D. Points A, B, and C on the isosceles trapezoid above are translated across line DF to points A', B', and C'. Whenever you reflect a figure across a line of symmetry, each point on the figure is translated an equal distance across the line of symmetry in the opposite direction, back on to the figure. The right half of a butterfly is folded across the vertical line, shown in black above, to complete the drawing of the butterfly. Folding half of the figure across the line of symmetry produces the other half of the figure. The letter W has one line of symmetry through its middle.Ī figure can have multiple lines of symmetry.Ī regular hexagon has 6 lines of symmetry.Īny line through a circle's center is a line of symmetry.Īny line of symmetry divides a figure into two mirror images. Line symmetryĪ figure has line symmetry if it can be reflected across a line back onto itself.Īn isosceles triangle has one line of symmetry from its vertex to the midpoint of the base. In Geometry, a figure can have reflection symmetry when it is reflected across a line or a plane. There are three basic types of symmetry: reflection, rotation, and point symmetry. Both plane and space figures may have symmetry. A figure or object has symmetry if a transformation(s) maps it back onto itself. In geometry, symmetry describes the balance a figure has. Home / geometry / shape / symmetry Symmetry
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