triangle geometry

geometrical properties of a triangle

en-US/ˈtɹaɪˌæŋɡəl d͡ʒiˈɑmətɹi/
en-GB/ˈtɹaɪæŋɡəl d͡ʒɪˈɒməˌtɹɪ/

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planimetricsmathematical theory