みかん三角不等式は定理っぽいけどなんでAD>ACが言えるのかわからん https://ja.wikipedia.org/wiki/%E4%B8%89%E8%A7%92%E4%B8%8D%E7%AD%89%E5%BC%8F#%E3%83%A6%E3%83%BC%E3%82%AF%E3%83%AA%E3%83%83%E3%83%89%E5%B9%BE%E4%BD%95%E5%AD%A6%E3%81%AE%E5%A0%B4%E5%90%88
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