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Transformation geometry

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Show $_p*$_l*$_p*$_l*$_p*$_l*$_p is a reflection in a line parallel to line l

note $_p is a reflection about the line p

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Solution Summary

This shows how to prove that a transformation is a reflection.

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Proof:
We can suppose the line l is the x-axis. For the line p, we have two cases.
Case 1: line p is parallel to line l, we can suppose p has the equation y=c. Then for any point (a,b), we have $_l(a,b)=(a,-b) and $_p(a,b)=(a,2c-b). Thus we ...

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