Are all circles similar? Explain the answer.

The adjacent figure shown below, depicts two blanket. If both blanket are similar, then what is the scale factor.

The adjacent figure shown below, depicts two blanket. If both blanket are similar, then find the value of $x$.

The adjacent figure shown below, depicts two blanket. If the both blankets are similar, then find the ratio of perimeter to the area of blanket.

The radius of a circular field is $52 \mathrm{m}$. Draw the map of this field on paper in which the scale is $13 \mathrm{m}:1 \mathrm{cm}$. What is the radius of the field on the map on paper.