directrix 的定义
plural di·rec·trix·es, di·rec·tri·ces [dih-rek-tri-seez, dahy-, dahy-rek-trahy-seez]. /dɪˈrɛk trɪˌsiz, daɪ-, ˌdaɪ rɛkˈtraɪ siz/.
- Geometry. a fixed line used in the description of a curve or surface.
- Archaic. a directress.
更多directrix例句
- The surface formed by revolving the catenary about its directrix is named the alysseide.
- Since the tension is measured by the height above the directrix these two catenaries have the same directrix.
- The only surface of revolution having this property is the catenoid formed by the revolution of a catenary about its directrix.
- Hence T, the point of intersection of Pp and Qq, must be the centre of similitude and must be on the common directrix.
- If the directrix, focus and eccentricity be given, we may employ the general method for constructing a conic.