# Math

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

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how can i help my son matthew about division and subtract borrow . thanks

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Please click Post a New Question and then ask your question. Also -- your question isn't clear. What exactly does Matthew need to know about division? Do you also want to know about how to borrow in subtraction problems?

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• Math -

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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