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# Conic Sections in Polar Coordinates

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(a)
Also, we have (1)
Pl is parallel to the x-axis, so Pl = DE (2)
And (3)
Substitute (2) and (3) to equation (1), we have
Therefore,

Then PF = r
According to the definition of e, we have , so

(*)

The conversion between the polar and rectangular coordinates is
(4)
Therefore, (5)
Square both sides of equation (*), we have
(6)
Substitute equations (4) and (5) to (6)

(7)
When e <1, , so , that is, the coefficient of is greater than 0. so it is an equation of ellipse.

When e > 1, , equation (7) is
, so it is an equation of hyperbola.

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Conic Sections in Polar Coordinates are investigated.

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4. The conversion between the polar and rectangular coordinates is
(1)
Therefore, (2)
Given that:
Cross-multiplying,
r + r e cos = ed, or r = ...

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