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本文讲解了三角形的基本定义、性质及分类，包括内角和定理、三边关系以及三角形的高、中线和角平分线的概念。学习目标是掌握三角形的相关知识和应用方法。文中还提供了多种例题和变式题以帮助理解和巩固知识。Full descriptionUploaded byhhqj0506AI-enhanced description

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本文讲解了三角形的基本定义、性质及分类，包括内角和定理、三边关系以及三角形的高、中线和角平分线的概念。学习目标是掌握三角形的相关知识和应用方法。文中还提供了多种例题和变式题以帮助理解和巩固知识。Full descriptionUploaded byhhqj0506AI-enhanced description

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