Below are several geometric figures that have rotational symmetry. Rules and practice includes definition and identification of rotation transformation, rotational symmetry, point symmetry, and rotations on a coordinate plane. Rotational symmetryĪ geometric figure or shape has rotational symmetry about a fixed point if it can be rotated back onto itself by an angle of rotation of 180° or less. Math: Geometry: Rotation (middle/HS) Overview. For 3D figures, a rotation turns each point on a figure around a line or axis. Two Triangles are rotated around point R in the figure below. The term 'preimage' is used to describe a geometric figure before it has been transformed and the term 'image' is used to describe it after it has been transformed.įor 2D figures, a rotation turns each point on a preimage around a fixed point, called the center of rotation, a given angle measure. On the right, a parallelogram rotates around the red dot. In the figure above, the wind rotates the blades of a windmill. A rotation is a type of rigid transformation, which means that the size and shape of the figure does not change the figures are congruent before and after the transformation. In geometry, a rotation is a type of transformation where a shape or geometric figure is turned around a fixed point. Home / geometry / transformation / rotation Rotation

Rotation rules geometry