Bugs: label when mirror a point at a line, (Geogebra 3.2)

zhaoqiang2010 shared this problem 11 years ago
Answered

In the activity 15 of Introduction to Geogebra (English edition), when mirror point A at line b according to the step 6, the real label of the A's mirror is " A' ", not " A[size=50]1[/size]' ", however, the mirror of point A at line a, A' , created at step 3, is labeled as " A'_1 " automaticly.

Comments (3)

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It's not a bug. First reflection of A is A', second is A'_1. Depends only on order of reflections, not the lines you are using. The introduction describes what happens if you follow the instructions in given order.

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"First reflection of A is A', second is A'_1. Depends only on order of reflections." , as described in the brochure, might be the original desire. However, factually, the first reflection of A is A', but it changes to A'_1 when the second reflection of A is created, and the second reflection is automaticly named A'.

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I'm sorry, I didn't read your post carefully. You're right, it's confusing. In current beta it works OK.

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