A target shown in the figure consists of three concentric circles of radii $3 \mathrm{cm}, 7 \mathrm{cm}$ and $9 \mathrm{c}\mathrm{m}$ respectively. A dart is thrown and land on the target. What is the probability that the dart will land on the shaded region?

In the figure, points $\mathrm{A}, \mathrm{B}, \mathrm{C}$ and $\mathrm{D}$ are the centres of four circles that each have a radius of length one unit. If a point is selected at random from the interior of square $\mathrm{A}\mathrm{B}\mathrm{C}\mathrm{D}$. What is the probability that the point will be chosen from the shaded region?

In the figure dart board is shown. The length of the larger square is $1.5$ times the length of side of the smaller square. If a dart is thrown and lands on the larger square. What is the probability that it will land in the interior of the smaller square?