Reflect the point at g and then at h.

• Right click anywhere in the construction window and select the macro "Reflect a point in a line".
• Click on line g, then on point P. This creates P*, which is the reflection of point P in line g.
• In order to apply the macro a second time, it is not necessary to right click and select the macro again. Simply click on h and then P* to reflect point P* in line h.
• A "Well done" screen should appear.

Think about these questions:

• The three points P, P*, and P** all lie on a circle. What is the center of this circle, and why?
• What happens to P** when P is moved on the circle? Why?

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