⒈ 圆的切线和过切点的弦所成的角。Gh3心趣莱学习网
英angle of osculation;Gh3心趣莱学习网
⒈ 圆的切线与过切点的任何弦所构成的角。Gh3心趣莱学习网
英语chord angle (i.e. angle a chord of a curve makes to the tangent)Gh3心趣莱学习网