• adj. 切線的，相切的；接觸的；離題的
• n. [數] 切線，[數] 正切
• n. (Tangent)人名；(瑞典)坦根特

來自拉丁語 tangere,接觸，觸摸，來自 PIE*tag,接觸，觸摸，安排，詞源同 integer,contact.后 用于數學術語指正切，切線。

tangent (adj.)

1590s, "meeting at a point without intersecting," from Latin tangentem (nominative tangens), present participle of tangere "to touch," from PIE root *tag- "to touch, to handle; border on; taste, partake of; strike, hit;" figuratively "affect, impress; trick, cheat; mention, speak of" (cognates: Latin tactus "touch;" Greek tassein "to arrange," tetagon "having seized;" Old English taccian "stroke, strike gently"). First used by Danish mathematician Thomas Fincke in "Geomietria Rotundi" (1583). Extended sense of "slightly connected with a subject" is first recorded 1825. Related: Tangence; tangency.

tangent (n.)

1590s as a geometric function, from tangent (adj.). From 1650s as "a tangent line." Figurative use of off on a tangent is from 1771.

1. The conversation went off at a tangent.

交談突然偏離了正題。

來自柯林斯例句

2. The graph of a concave function is always below its tangent.

一個凹函數的圖象總在它的切線的下方.

來自辭典例句

3. The tangent may be used to find the direction.

這方向也可用正切求得.

來自辭典例句

4. For? 0 we naturally get a circle; for? 0 we obtain two tangent circles.

對? 0我們當然得到一個圓; 對? 0得到兩個相切的圓.

來自辭典例句

5. It's not easy to follow her thought because she's always going off at a tangent.

要跟上她的思路并非易事,因為她老是突然扯到題外去.

來自辭典例句