Object Reflections and Symmetry

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Presentation transcript:

Object Reflections and Symmetry Module 9 HigherEdServices.org

Session Topics Reflection of an object Planes of symmetry Reflections through rotations

Reflection A reflection across a plane displays the object’s mirror image. Reflection Plane Each point, A, is associated with an image point, A’, such that the plane, P, is a perpendicular bisector of the line segment AA’.

Plane of Symmetry Plane of symmetry occurs if the parts of the object on both sides of the plane are mirror images of each other.

Reflection through Rotation For a symmetric object, the mirror image can occur by rotating one side of the object 180°about an axis of rotation that's in the plane of symmetry.

Multiple Planes of Symmetry Many objects have multiple planes of symmetry Infinite 5 2

Course Software….. Work through the Reflections and Symmetry software module

Object Reflections and Symmetry Homework … Complete the following pages in Module 9 reflx/sym- 2 - 5 8 - 9 12 - 15