- Applymatrixmultiplicationto rotations.
SampleRotations
In this lessonwe limit our studyto rotationscenteredat the originof a coordinateplane.We beginwith some
specificexamplesof rotations.Laterwe’ll see how theserotationsfit into a generalformula.
Rememberhow a rotationis defined.In a rotationcenteredat the originwith an angleof rotationof a
pointmovescounterclockwisealongan arc of a circle.The centralangleof the circlemeasures The
originalpointis one endpointof the arc, and the imageof the originalpointis the otherendpointof the arc.
180°Rotation
Our first exampleis rotationthroughan angleof.
In a rotation,the imageof is the point.