Last Updated
：2025/11/20
focal
IPA(Pronunciation)
Noun
obsolete
Japanese Meaning
（幾何学、古語）円錐の軸に直交する2本の線のうちの一方で、軸とのなす角の余弦が、円錐の半角の余弦の比に等しいもの
Sense（1）
Sense（3）
（ plural ）
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(geometry, obsolete) One of two lines perpendicular to the axis of a cone such that the cosine of the angle between the line and the axis is equal to the ratio of the cosines o the semiangles of the cone.
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focal
The mathematician located a focal of the cone, one of the two lines perpendicular to the axis whose cosine of the angle with the axis equals the ratio of the cosines of the semiangles.
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The mathematician located a focal of the cone, one of the two lines perpendicular to the axis whose cosine of the angle with the axis equals the ratio of the cosines of the semiangles.
音声機能が動作しない場合はこちらをご確認ください
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