| 单词 | focal tangent |
| 释义 | > as lemmasfocal tangent ΘΚΠ the world > relative properties > number > geometry > line > [noun] > tangent touchline1551 adscript1636 tangent1655 focal tangent1706 semi-tangent1823 tractor1867 bitangent1873 slope1889 1706 W. Jones Synopsis Palmariorum Matheseos 249 Sup. any Ordinate mr, of an Ellipse, to meet the Focal Tangent. 1773 Philos. Trans. (Royal Soc.) 63 355 Let DΣ be any Ordinate to the axe Aa, cutting the curve in Σ, and the focal tangent ΦG in σ. 1871 Messenger Math. 5 136 Let δ be the distance from the focus to the point of contact of the focal tangent. < as lemmas |
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