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Question

Two triangular billboards are installed on a highway. Let the billboards be represented by ABC and DEF. The billboards are mechanically designed in such a way that the names of the vertices of DEF are cyclically interchanged every 1 minute, i.e. the triangles remain the same way, only the names of the vertices change. At 10 AM, for the first time the positions of the billboards are such that we can say ABC≅ DEF. After x minutes, the billboards will be in such a way, that ABC≅ DEF for the second time. Find x.

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Solution

Since at 10 AM, we can write ABC DEF, the congruency conditions for the next minutes would be:

ABC EFD 10:01 AM

ABC FDE 10:02 AM

ABC DEF 10:03 AM

Therefore, after 3 minutes, we can say that ABC DEF for the second time.


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