Lesson25_students_

Lesson25_students_ - MA 15400 Lesson 25 Parabolas Section...

This preview shows pages 1–2. Sign up to view the full content.

Lesson 25 Section 11.1 Parabolas 1 The graphs above represent parabolas. A horizontal parabola will open left or right. A vertical parabola opens up or down. A parabola is the set of all points in a plane ( only 2 dimensions) equidistant from a fixed point F (the focus ) and a fixed line l (the directrix ) that lie in the plane. The axis of the parabola is the line through F that is perpendicular to the directrix. The vertex of the parabola is the point V on the axis halfway from F to l . The vertex is the point on the parabola that is closest to the directrix. The fixed point, the focus, will always be ‘inside’ the parabola and the fixed line, the directrix, will always be ‘outside’ of the parabola. Every point on the parabola, represented by B in the picture, the distance from B to the focus F is equal to the distance from B perpendicular to the line at point C. VERTEX A horizontal parabola has a horizontal axis. A vertical parabola

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 5

Lesson25_students_ - MA 15400 Lesson 25 Parabolas Section...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online