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Mathematics 12 Online
OpenStudy (anonymous):

Given the polygon containing Point P. Point P is rotated 90° about the origin. Its image is Point P is (2,5) So how do i rotate it by 90?

OpenStudy (anonymous):

@ganeshie8 any idea?

ganeshie8 (ganeshie8):

by 90 degrees they mean 90 degrees counter clockwise

ganeshie8 (ganeshie8):

you may memorize this rule for 90 degrees counterclockwise rotation : \[(x,~y) \longrightarrow (-y,~ x)\]

ganeshie8 (ganeshie8):

\[(2,~5) \longrightarrow (?,~ ?)\]

OpenStudy (anonymous):

Ahhh dang you're right! So then it would (-5,2) thanks again!

ganeshie8 (ganeshie8):

looks good!

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