搜索 - 科创

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一构造黄金三角形（底角为72°的等腰三角形）这一步主要的目的是求18°的三角函数值，先构造一个黄金三角形(如图)在中，过点作的角平分线交边BC于点E。

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约找到 1 条结果，耗时 0.153 秒

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