Part a:
P is a circle of radius 3.
We want to draw a figure with a scale factor of 1/3. So we need to draw a circle with a radius of (1/3)*3 = 3/3 = 1, which is drawn below
Part b:
The circle P is a circle with a radius of 3.
The circle P' is a circle with a radius of 2.
So the scale factor of P to P' is 2/3.