EXERCISE 16.4

Two crossroads, each of width $3 \mathrm{m}$, run at right angles and parallel to the sides of a rectangular plot of dimensions $80 \mathrm{m}\times 60 \mathrm{m}$. Find the area of the roads.

A square field of side $800 \mathrm{m}$ has two crossroads that cut at right angles through the centre of the field. Find the area of the field, excluding the crossroads in hectares, given that the width of both the roads are $4 \mathrm{m}$ and they are parallel to the sides of the field.

There is a circular waterbed of diameter $14 \mathrm{m}$ in a garden. It is surrounded by a path of width $2 \mathrm{m}$ to keep flower pots. Find the area of the path and also calculate the cost of cementing this path at the rate of $₹ 32 \mathrm{per} \mathrm{sq}.\mathrm{m}$. (Take $\mathrm{\pi }=\frac{22}{7}$)

There is a circular waterbed of radius 5 m inside the rectangular park of length 15 m and breadth 12 m as shown in the figure. Find the area of the park excluding the waterbed and also find the cost of fencing the waterbed at the rate of rs 60 per sq.m. (Take $\mathrm{\pi }=3.14$)

Find the area of the shaded regions in the following figure:

Find the area of the shaded regions in the following figure:

Find the area of the shaded regions in the following figure:

Find the area of the shaded regions in the following figure: