## What is the directrix of an ellipse?

Directrix of ellipse is a line parallel to the latus rectum of the ellipse and are perpendicular to the major axis of the ellipse. The ellipse has two directrices. The two directrix of ellipse are equidistanct from the center or the minor axis of the ellipse.

## What are the different methods of construction of an ellipse?

Methods of constructing Ellipse include: i Concentric circles method ii The focal point method iii The rectangular method. (i) Draw AB and CD, the given axes. (ii) With C as centre, radius half the major axis, draw an arc cutting AB at the foci F1 and F2 into a number of equal parts, numbering as shown .

What is focus and Directrix of ellipse?

An ellipse is the locus of a point in a plane which moves in the plane in such a way that the ratio of its distance from a fixed point (called focus) in the same plane to its distance from a fixed straight line (called directrix) is always constant which is always less than unity.

What is meant by eccentricity in directrix focus method?

The eccentricity of the conic section is defined as the distance from any point to its focus, divided by the perpendicular distance from that point to its nearest directrix.

### What is the focal property of ellipse?

The foci of an ellipse, E and F, lie on the ellipse’s major axis and are equidistant from the center. The sum of the distances from any point P on the ellipse to these two foci is equal to the length of the major axis.

### Which of the following method is used to construct ellipse?

Which of the following is used for the construction of ellipse? Explanation: For the construction of ellipse we use trammel method. Rectangle method and circular methods are used for the construction of parabola.

What is the formula of eccentricity of ellipse?

The general equation of an ellipse is written as: x 2 a 2 + y 2 b 2 = 1. and the eccentricity formula is written as. 1 − b 2 a 2. For an ellipse, a and b are the lengths of the semi-major and semi-minor axes respectively.