euclidean geometry歐式幾何(空間為平面)
Euclid's postulates*
rule1:
兩點最近距離是一條線
a straight line is the shortest possible line between two points.
rule2:
平行線之兩線距離一樣(無限延伸)
parallel lines are a constant distance from each other
rule3:
三角形度數和為180度
the angles in triangles always add up to 180度
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