Un cilindro de radio 2 m. rueda hasta que
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The reflection of a point A(a, b) across the x-axis, is the point A'(a, -b).
Thus the point P(-1, 6) is reflected to P'(-1, -6).
Check the picture.
Thus the point P(-1, 6) is reflected to P'(-1, -6).
Check the picture.