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... racters "ju" and "gou".
"Ju" indicates obtuse, and "gou" indicates acute.
"Ju and gou with the ruler" means a right angle.
But the second method is more complicated.
It is somewhat similar to measuring directions:
Using the twelve earthly branches: Zi, Chou, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu, Hai, together with the ten Heavenly Stems: Jia, Yi, Bing, Ding, Geng, Xin, Ren, Gui and the eight trigrams: Qian, Kun, Gen, Xun to create a set of twenty-fou ...
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