Taivo A Taiwan Mandarin dictionary

弦切角

xiánqiējiǎo

ㄒㄧㄢˊ ㄑㄧㄝ ㄐㄧㄠˇ

  1. 1chord angle (i.e. angle a chord of a curve makes to the tangent)

Keep 弦切角 and it comes back until you know it.

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