great elliptic arc
... 日潮差 great diurnal range 大椭圆弧 great elliptic arc 冰期 great ice age ...
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文中通过分析图形中的边角关系，推导出确定椭圆大、小圆弧半径长度的通用计算公式。
The author analyzes the relationship between side and Angle in a diagram to deduce a new general-purpose formula which can determine the length of arc radius and the size of an ellipse.
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