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How to rotate a triangle in an equation

  1. Sep 24, 2014 #1
    Hi,

    i have a set of definition for a triangle shape:

    -3/4<x<3/4

    -x/sqrt(3) + sqrt(3)/4 < y < x/sqrt(3) +sqrt(3)/4

    The centroid of this triangle is at 0,0

    i want to rotate this triangle by a certain degree from the centroid but i am not sure how, because if i just multiply it by cos or sin of the angle, it will just become smaller.

    any hints will be appreciated.
     
  2. jcsd
  3. Sep 24, 2014 #2
    Any point can be rotated around the origin by rotating the coordinate system.
    PassiveActive.JPG
     
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