平面幾何 angolul

plane geometry▼(study of figures having parts that lie in a singular plane)
noun
[UK: ˈpleɪn.dʒɪ.ˈɒ.mɪ.trɪ] [US: ˈpleɪn.dʒɪ.ˈɒ.mɪ.trɪ]