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高中几何/直角三角形三角法
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来自维基教科书，面向开放世界领域的开放书籍
<
高中几何
直角三角形三角法
勾股定理
勾股定理的逆定理
使用相似直角三角形
特殊直角三角形
正切比值
正弦和余弦比值
反三角函数比值
锐角三角形和钝角三角形
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书籍：高中几何
华夏公益教科书
