| 词汇 | bitangent |
| 释义 | BETA Examples of bitangentbitangent isn’t in the Cambridge Dictionary yet. You can help! Bitangent lines can also be defined when one or both of the circles has radius zero. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. If both circles have radius zero, then the bitangent line is the line they define, and is counted with multiplicity four. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Furthermore, it is included in every bitangent plane. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Bitangent lines can also be generalized to circles with negative or zero radius. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. If counted with multiplicity (counting a common tangent twice) there are zero, two, or four bitangent lines. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Finally, if the two circles are identical, any tangent to the circle is a common tangent and hence (external) bitangent, so there is a circle's worth of bitangents. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Bzout's theorem implies that a plane curve with a bitangent must have degree at least 4. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. If one circle has radius zero, a bitangent line is simply a line tangent to the circle and passing through the point, and is counted with multiplicity two. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. |
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