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# 拋物線 - PowerPoint PPT Presentation

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## PowerPoint Slideshow about '拋物線' - zyta

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Presentation Transcript

• 給定一條直線 L和一個定點 F，

• 所有滿足 PF= d ( P, L )之動點 P所描繪的圖形。

F

P

L

• 以垂直 x軸的直線 L為準線，

• 焦點F在 x 軸上，頂點V 在原點的拋物線。

y

L

F

x

V

• 令 F(c,0)，c>0，L：x = c。

y

L

( c , 0 )

F

x

V

• P ( x , y ) 為拋物線上任一點，PF = d (P, L)

y

L

( c , 0 )

F

x

P

• P ( x , y ) 為拋物線上任一點，PF = d (P, L)

y

L

( c , 0 )

F

x

P

• P ( x , y ) 為拋物線上任一點，PF = d (P, L)

PF = d (P, L)

y

L

x

F