| 1. | Construction on the Polar Line started from January 1943.
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| 2. | Also, the polar line of a focus of the conic is its corresponding directrix.
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| 3. | Let line be the polar line of point with respect to the non-degenerate conic.
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| 4. | The concepts of " a pole and its polar line " were advanced in projective geometry.
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| 5. | He also made discoveries about projective harmonic conjugates; relating these to the poles and polar lines associated with conic sections.
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| 6. | This definition implies that the hyperbola is both the envelope of the polar lines of the points on " B ".
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| 7. | Just as uniquely determines its polar line ( with respect to a given conic ), so each line determines a unique pole.
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| 8. | For such a conic section, the polar line to a given pole point ( ?, ? ) is defined by the equation
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| 9. | Work progressed with limited supplies and those needed for the Polar Line were cannibalized to give way for the airport's completion.
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| 10. | The length of polar lines are half that of the equator, and lines of longitude are semiellipses, or portions of ellipses.
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