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Technical Drawing  Exam Papers  Higher  1996  Paper 1Question 5Fig. 4 shows a circle and one convolution of a logarithmic spiral. The spiral has an initial radius of 45mm and the lengths of succeeding radii decrease in the ratio of 8 : 9 over successive 30° intervals. (a) Draw the given circle and logarithmic spiral. (b) The circle rolls along the line AB for one complete revolution. During the rolling of the circle the point P moves along the straight line to C. 


