Question

In arcs of circles method, the foci are constructed by drawing arcs with centre as one of the ends of the ____ axis and the radius equal to the half of the ____ axis.

(a) Minor, major

(b) Major, major

(c) Minor, minor

(d) Major, minor

The question was asked during an online interview.

My doubt is from Construction of Ellipse topic in portion Geometrical Construction of Engineering Drawing

Answer 1

Correct choice is (a) Minor, major

The explanation: In arcs of circles method, the foci are constructed by drawing arcs with centre as one of the ends of the minor axis and the radius equal to the half of the major axis. This method is used when we know only major and minor axes of the ellipse.