... OE=HA=OH=AE (9)四邊形AEOH為正方形(10)同理可證: ∠B=∠OEB=∠EOF=∠OFB=90° OE=BE =FB=OF 四邊形BEOF為正方形(11) ∠EOF+∠EOH=90°+90°=180° (12) F、O、H三點共 ...
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