6) What name the curve traced out by a point on the circumference of a circle that rolls outside another circle of larger diameter?

7) What is set of points on the major axis at equidistant from centre to create the curve of ellipse?

8) What is the term for double ordinate that passes through the focus?

9) What is the chord perpendicular to the axis of hyperbola?

10) What is the eccentricity of hyperbola?