Question

If eccentricity of ellipse is 3/7, how many divisions will the line joining the directrix and the focus have in general method?

(a) 10

(b) 7

(c) 3

(d) 5

I got this question by my college professor while I was bunking the class.

This is a very interesting question from Construction of Ellipse in section Geometrical Construction of Engineering Drawing

Answer 1

The correct answer is (a) 10

The best explanation: In the general method of drawing an ellipse, if eccentricity of the ellipse is given as 3/7 then the line joining the directrix and the focus will have 10 divisions. The number is derived by adding the numerator and denominator of the eccentricity.