定义:在一个三角形中,如果有一个角是另一个角的2倍,�们称这两个角互为“开心角”,这个三角形叫做“开心三角形” 例如:在 Abc中,∠a Template


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tomski定义:在一个三角形中,如果有一个角是另一个角的2倍,�们称这两个角互为“开心角”,这个三角形叫做“开心三角形” 例如:在 abc中,∠a coloring