Math refresher: N = (y1 - y0, -(x1 - x0)) V = (x - x0, y - y0) N • V = (y1 - y0)(x - x0) + (-(x1 - x0)(y - y0))
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Math refresher: N = (y1 - y0, -(x1 - x0)) V = (x - x0, y - y0) N • V = (y1 - y0)(x - x0) + (-(x1 - x0)(y - y0))