三角形

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()()(zài )()(zhí )线(xiàn )(shàng )(de )(sān )(diǎn )(liǎng )(liǎng )(yòng )线(xiàn )(duàn )(lián )(jiē )()(lái )(de )()(xíng )()(diǎn )(chēng )(wéi )(dǐng )(diǎn )”,(lián )(jiē )(èr )(dǐng )(diǎn )(de )线(xiàn )(duàn )(chēng )(wéi )(biān )”,(měi )(liǎng )(biān )(suǒ )(jiá )(de )(jiǎo )(chēng )(wéi )(nèi )(jiǎo )”。()(chēng )(sān )(biān )(xíng )

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●三角形(简体版)

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