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Find the measure of the acute or right angle formed by intersecting lines so that C can be mapped to C' using two reflections. The rotation (x, y)→(y, -x) maps C to C'.
The rotation is a 270 counterclockwise rotation, that is equivalent to 90 clockwise rotation,
The reflection on intersecting lines theorem considers the acute or right angel of the intersecting lines.
So, We will consider that the rotation is 90 clockwise.
The angle of intersection is 45
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