# What is the axis of symmetry given the vertex and Directrix?

Table of Contents

## What is the axis of symmetry given the vertex and Directrix?

The axis of symmetry is the vertical line right through the vertex: x = 0. Then the focus is one unit above the vertex, at (0, 1), and the directrix is the horizontal line y = –1, one unit below the vertex.

## How do you find the vertex focus axis of symmetry and Directrix?

The standard form is (x – h)2 = 4p (y – k), where the focus is (h, k + p) and the directrix is y = k – p. If the parabola is rotated so that its vertex is (h,k) and its axis of symmetry is parallel to the x-axis, it has an equation of (y – k)2 = 4p (x – h), where the focus is (h + p, k) and the directrix is x = h – p.

## What is an equation of the parabola with vertex at the origin and focus (- 5 0?

Explanation: Focus is at (5,0) and vertex is at (0,0) . the equation of parabola is y2=4ax , a=5 is the focal distance (the distance from vertex to focus).

## How do you find the vertex of a parabola using an equation?

y=ax2+bx+c . In this equation, the vertex of the parabola is the point (h,k) . You can see how this relates to the standard equation by multiplying it out: y=a(x−h)(x−h)+ky=ax2−2ahx+ah2+k .

## How do you identify a conic equation?

If they are, then these characteristics are as follows:

- Circle. When x and y are both squared and the coefficients on them are the same — including the sign.
- Parabola. When either x or y is squared — not both.
- Ellipse. When x and y are both squared and the coefficients are positive but different.
- Hyperbola.

## How do you know if a parabola is wide or narrow?

If a>0 in f(x)=ax2+bx+c, the parabola opens upward. In this case the vertex is the minimum, or lowest point, of the parabola. A large positive value of a makes a narrow parabola; a positive value of a which is close to 0 makes the parabola wide. If a<0 in f(x)=ax2+bx+c, the parabola opens downward.

## Why is a hyperbola not 2 parabolas?

Summary: When a set of points present in a plane are equidistant from the directrix, a given straight line, and are equidistant from the focus, a given point which is fixed, it is called a parabola. In a parabola the two arms become parallel to each other whereas in a hyperbola they do not.

## What are the similarities and differences of parabola and hyperbola?

A parabola is a single open curve that extends till infinity. It is U-shaped and has one focus and one directrix. A hyperbola is an open curve having two unconnected branches. It has two foci and two directrices, one for each branch.

## What are the similarities and differences between Eclipse and circle?

A circle is a closed curved shape that is flat. That is, it exists in two dimensions or on a plane. In a circle, all points on the circle are equally far from the center of the circle. An ellipse is also a closed curved shape that is flat.

## What are similarities and differences between ellipse and circle?

Circle is a locus of all points on a plane equidistant from one particular point called its center. Ellipse is a locus of all points on a plain, whose sum of distances of two particular points called focuses is the same.

## Is parabola a closed curve?

In mathematics, a parabola is a plane curve which is mirror-symmetrical and is approximately U-shaped. It fits several superficially different mathematical descriptions, which can all be proved to define exactly the same curves. One description of a parabola involves a point (the focus) and a line (the directrix).

## Can a parabola be closed?

This shows that the distance of the vertex from the focus is less than the distance of P from the focus, so the point of the parabola closed to focus is the vertex.

## Is hyperbola a closed curve?

By extending the Euclidean plane to include a line at infinity, obtaining a projective plane, the apparent difference vanishes: the branches of a hyperbola meet in two points at infinity, making it a single closed curve; and the two ends of a parabola meet to make it a closed curve tangent to the line at infinity.

## What is the similarities between ellipse and hyperbola?

A hyperbola is related to an ellipse in a manner similar to how a parabola is related to a circle. Hyperbolas have a center and two foci, but they do not form closed figures like ellipses. The formula for a hyperbola is given below–note the similarity with that of an ellipse.

## What is the ellipse of a perfect circle?

Anatomy of an ellipse: When we view a circle at an angle we see an ellipse. We refer to this viewing angle as the degree of the ellipse. A perfect circle is viewed at 90 degrees and at angles less than that we see various degree ellipses on the way down to a zero degree ellipse (a straight line).