| 单词 | polar equation |
| 释义 | > as lemmaspolar equation polar equation n. Geometry an equation of a curve or surface expressed in polar coordinates. ΚΠ 1813 Philos. Trans. (Royal Soc.) 103 12 By the polar equation of the curve, SQ = p/ 2. cosec.(MSQ/ 2)2. 1848 G. Salmon Treat. Conic Sections ii. 25 To find the polar equation of a right line. 1989 Encycl. Brit. XXVIII. 888/1 The circle x2 + y2 = a2 has the polar equation (r cos θ)2 + (r sin θ)2 = a2, which reduces to r = a. < as lemmas |
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