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11.3 两条直线的位置关系
第二课时 两条直线的夹角
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我们规定:两条相交直线所成的锐角或直角为两条相交直线的夹角。
两条相交直线的夹角的取值范围是:
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1.两条直线的夹角公式
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1.两条直线的夹角公式
两条直线的夹角公式 (书P19)
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2.夹角与斜率的关系
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2.夹角与斜率的关系
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