Posted by **Breanna** on Tuesday, September 9, 2008 at 12:13pm.

please illustrate how to rotate a triangle counterclockwise from the origin with coordinates A(2,0),B(7,0),

C(7,2). Thank you.

- Math -
**MATTHEW**, Tuesday, September 9, 2008 at 12:38pm
how can i help my son matthew about division and subtract borrow . thanks

- Math -
**bobpursley**, Tuesday, September 9, 2008 at 3:55pm
For each point to be rotated, use this set of equations:

x'=x*cos(theta)+y*sin(theta)

y'=-x*sin(theta)+y*cos(theta)

where x,y is the original point, and theta is the chosen angle of rotation counterclockwise.

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