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Understanding rotation of arbitrary points

The distance between point PP and the origin, OO, is rr units. The line OPOP forms an angle of Ï•\phi with the xx-axis.
Point P′P' is the result of rotating point PP, θ\theta degrees counter-clockwise around the origin.
The line AP′AP' forms a right angle with line OPOP.
If point P′P' is at (x′,y′)(x', y'), x′x' is equal to the length of which line segment?
Choose 1 answer:
Choose 1 answer: