... 瞬时速度 instantaneous velocity 圆的切线 tangent line of a circle 切线 tangent line ...
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「切线判定定理:经过半径的外端而且垂直于该半径的直线是圆的切线(tangent perpendicular to radius)「切线长定理(tangent from external point)..
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这条直线叫做圆的切线 tangent line
二圆的内切线 internal tangent of two circles
圆弧的切线方向 Arc tangent direction ; Arc tangent
圆周的切线向的 circumferential
与二圆弧相切的线 Arcs
讨论了圆的切线及两圆内外公切线的一般求法及步骤。
The general ways and procedures of working out internal and external co-tangents of circles are discussed.
用最明显的图形来描述这个过渡的特性就是：当在两个圆之间绘制一条直线，直线与每个圆只有一个交点时，那么这条线就是两个圆的切线。
The quality of this transition is best visualized by a straight line drawn between two circles: the line's only point of contact with each circle is tangential.
绿色螺旋线由内部每一个正方形和四分之一圆相切线构成，而红色的螺旋线是黄金螺旋线，它是对数螺旋线的一种特殊类型。
The green spiral is made from quarter-circles tangent to the interior of each square, while the red spiral is a Golden spiral, a special type of logarithmic spiral.
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