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I've been trying to calculate the new intersection on the x-axis after rotation of any given rectangle. The rectangle's center is the point $(0,0)$.

What do I know:

  • length of B (that is half of the width of the given rectangle)
  • angle of a (that is the rotation of the rectangle)

What do I want to know: length of A (or value of point c on the x-axis).

2 Answers 2