What is the Directrix of a hyperbola?
Eleanor Gray
Updated on May 19, 2026
What is the Directrix of a hyperbola?
Directrix of a hyperbola is a straight line that is used in generating a curve. It can also be defined as the line from which the hyperbola curves away from. This line is perpendicular to the axis of symmetry. The equation of directrix is: x=±a2√a2+b2.
How do you find the Directrix of a rectangular hyperbola?
The equation of the directrices of the rectangular hyperbola xy=c2 :
- A. x+y=c2
- B. x+y=c.
- C. x−y=c2
- D. x−y=c.
What is the definition of rectangular hyperbola?
A hyperbola for which the asymptotes are perpendicular, also called an equilateral hyperbola or right hyperbola. This occurs when the semimajor and semiminor axes are equal. This corresponds to taking , giving eccentricity .
What is the condition of rectangular hyperbola?
A hyperbola is said to be rectangular if its transverse and conjugate axis are equal, i.e. if. 2a=2b⇒a=b. Thus, the equation of a rectangular hyperbola is of the form. x2−y2=a2.
What are the asymptotes of a hyperbola?
All hyperbolas have two branches, each with a vertex and a focal point. All hyperbolas have asymptotes, which are straight lines that form an X that the hyperbola approaches but never touches.
How do you find the Directrix of an equation?
How to find the directrix, focus and vertex of a parabola y = ½ x2. The axis of the parabola is y-axis. Equation of directrix is y = -a. i.e. y = -½ is the equation of directrix.
What are rectangular asymptotes?
The asymptotes of rectangular hyperbola are y = ± x. If the axes of the hyperbola are rotated by an angle of -π/4 about the same origin, then the equation of the rectangular hyperbola x 2 – y 2 = a 2 is reduced to xy = a2/2 or xy = c2. When xy = c2, the asymptotes are the coordinate axis.
How do you find the asymptotes of a hyperbola?
A hyperbola with a vertical transverse axis and center at (h, k) has one asymptote with equation y = k + (x – h) and the other with equation y = k – (x – h).
How do you find the Directrix of a hyperbola?
The directrix is the line which is parallel to y axis and is given by x=ae or a2c and here e=√a2+b2a2 and represents the eccentricity of the hyperbola. So x=3.2 is the directrix of this hyperbola.
How do you find the Directrix and focus of an equation?
Focus & directrix of a parabola from the equation So the focus is (h, k + C), the vertex is (h, k) and the directrix is y = k – C.
