如图,过点P做垂直于矩形四边的垂线,分别相交
∵AE=BG,EP=HC=AF,GD=EC=HP,HD=FB=PG,
∴PA²=EP²+AE²,PD²=PG²+GD²,
PB²=PG²+AE²,PC²=GD²+GD²,
∴PA²+PD²=PB²+PC².
如图,过点P做垂直于矩形四边的垂线,分别相交
∵AE=BG,EP=HC=AF,GD=EC=HP,HD=FB=PG,
∴PA²=EP²+AE²,PD²=PG²+GD²,
PB²=PG²+AE²,PC²=GD²+GD²,
∴PA²+PD²=PB²+PC².