为什么欧氏几何定义三角形内角和 180 度,而不是别的例如更好记的 100 度? 知乎 Template




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Try and sketch some of theseBaseball diamond, Camping, Water buffalo, Top, Cathedral, Dinner, Cannery, Peas, Amusement park, Tinfoil hat, view more ideas


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tomski为什么欧氏几何定义三角形内角和 180 度,而不是别的例如更好记的 coloring