Үшбұрыштың биіктігі - үшбұрыштың төбесінен қарсы жатқан қабырғасы арқылы өтетін түзуге түсірлген перпендикуляр, медиана - үшбұрыштың бір төбесін оған қарсы қабырғасының ортасымен қосатын кесінд, биссетриса - бұрыштың төбесі арқылы өтетін және оны қақ бөлетін түзу сызық, Тең бүйірлі үшбұрыш - Егер үшбұрыштың екі қабырғасы тең болса, онда үшбұрыш тең бүйірлі деп аталады, Тең қабырғалы үшбұрыш - Егер үшбұрыштың барлық қабырғалары өзара тең болса, онда үшбұрыш тең қабырғалы деп аталады, Тікбұрышты үшбұрыш - бір бұрышы тік, яғни 90°-қа тең болған үшбұрыш, Сыбайлас бұрыштар - Бір қабырғасы ортақ, ал қалған екі қабырғасы толықтауыш сәулелер болса, онда бұндай бұрыштар, Вертикаль бұрыштар - Бір бұрыштың қабырғалары екінші бұрыштың қабырғаларының толықтаушы сәулелері болса,
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