Mathematics
Senior High
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159 △ABCの辺BC上に頂点と異なる点Dをとり, ∠ADB, ∠ADC の二等
分線が AB, AC と交わる点をそれぞれE,F とすると, AD, BF, CEは
→教p.101 Column
1点で交わることを証明せよ。
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