R S Aggarwal Solutions for Chapter: Mensuration, Exercise 2: EXERCISE 20B

A rectangular lawn $70 \mathrm{m} \mathrm{by} 50 \mathrm{m}$has two roads, each$5 \mathrm{m}$ wide, running through its middle, one parallel to its length, and the other parallel to its breadth. Find the cost of constructing the roads at $₹ 120 \mathrm{per} {\mathrm{m}}^2$.

A $115 \mathrm{m}$ long and $6$$4 \mathrm{m}$ broad lawn has two roads at right angles, one $2 \mathrm{m}$ wide, running parallel to its length, and the other $2.5 \mathrm{m}$ wide, running parallel to its breadth. Find the cost of gravelling the roads at $₹ 60 \mathrm{per} {\mathrm{m}}^2$.

A rectangular field is $50 \mathrm{m} \mathrm{by} 40 \mathrm{m}$. It has two roads through its centre, running parallel to its sides. The width of the longer and the shorter roads are $2 \mathrm{m}$ and $2.5 \mathrm{m}$ respectively. Find the area of the roads and the area of the remaining portion of the field.

Calculate the area of the shaded region in the figure given below:

If the area of the shaded region is $k {\mathrm{m}}^2$ in the below figure, then find the value of $k$.

Calculate the area of the shaded region in the below figure:

Calculate the area of the shaded region in the figure given below.
Figure has uniform width of $3$ cm and it is given that $AB=CD$.

In the given figure, all steps are$0.5 \mathrm{m}$ high. Find the area of the shaded region.