How To Count & say the numbers in Cherokee. Check out this instructional language video to learn how to speak Cherokee! In this lesson, learn how to count the numbers one through twenty. This tutorial is great for beginners who want to improve their Cherokee language skills. Practice your Cherokee by learning the numbers and how to count! Check out this instructional language video to learn how to speak Cherokee! In this lesson, learn how to count the numbers one through twenty.
Directrix of a Parabola. A line perpendicular to the axis of symmetry used in the definition of a parabola. A parabola is defined as follows: For a given point, called the focus, and a given line not through the focus, called the directrix, a parabola is the locus of points such that the distance to the focus equals the distance to the directrix.
A fixed line used in describing a curve or surface. âIn the following, the feet of perpendiculars dropped from points A, B, etc. on the parabola to the directrix will be denoted A â, B â, etc.â. âIt is the pedal curve of the parabola where the pedal-point is taken as the reflection of the focus in the directrix.â. âThe directrix is used in the construction, which follows, mutatis mutandis, the same course as the above construction in the case of the ellipse.â.