Polygonal Number 多邊形數

Proof without words. reproduced from http://120.101.70.8/longlife/GeoGebra/GGB_Teach/Sequence_Series/Sequence_Series-13.html by 阿壽工坊---官長壽. see also http://www.hkame.org.hk/html/modules/tinyd2/content/Edumath/v14/12Leung(poly).pdf

 
 
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