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# Finding the points of a square, given its centre point, length and rotation Watch

1. I can't for the life of me figure out how to do this. I thought it would be trivial...

Say I have a square and I know its centre point and width

I can find each point by adding or subtracting the width/2 to the centre point...

but when the square is rotated... I can't figure out how to do it :| Dear lord, how do I have a maths A level?
2. If (x,y) is on your square, then apply the rotation matrix (for an angle theta) to (x,y) to get (x',y')?

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Updated: December 17, 2010
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