POLYGON AND SYMMETRY 2
X XXXX XX symmetry is XXXX XX XXX folding of XXXXX so that the XXXXXX XXXX XXXX perfectly on top with XXX XXXXX matching.
XX a regular XXXXXXXX XXXX XXXXX of XXXXXXXX.
XX,XXXX g XX the XXXX XX XXXXXXXX XX the given XXXXXXX polygon.
XXXX,equilateral triangle XXX XXXXXXX XXXXX XXXXX of XXXXXXXX.
Thustrapezoid XXX XXXXXXXXXX symmetry.
The XXXXX XX XXX XXX right corner, if XXXXXX XXXXXXXXXXXX or XXXXXXXXXX through the XXXXXXX, it forms mirror image of XXX part XX other in XXXX XXXXX.
Thus ,XXX XXX two shapes XXXX line XX XXXXXXXX.