Technical Drawing - Exam Papers - Ordinary - 2007 - Paper 1

Question 4

Below is shown a circle R and a semicircle S, which are in contact with the line AB as shown. Also shown are two points P and Q on the circumference of the circle and the semicircle respectively.

(a) The circle R rolls clockwise along the line AB until P reaches the line AB.
Plot the locus of P for this movement.

(b) The semicircle S rolls anticlockwise along the line AB until Q reaches the line AB.
Plot the locus of Q for this movement.