R S Aggarwal Solutions for Chapter: Mensuration, Exercise 1: EXERCISE 20A

If the area of the rectangle is $k {\mathrm{m}}^2$, whose dimensions are: length $=24.5$ $\mathrm{m}$, breadth$= 18$ $\mathrm{m}$, then find the value of $k$.
 

If the area of the rectangle is $k {\mathrm{m}}^2$, whose dimensions are: length$=12.5 \mathrm{m}$, breadth$=8 \mathrm{dm}$, then find the value of $k$.

The area of a rectangular field is $3584 {\mathrm{m}}^2$ and its length is $64 \mathrm{m}$. A boy runs around the field at the rate of $6 \mathrm{km}/\mathrm{h}$. How many minutes will he take to go $5$ times around it?

A verandah is $40 \mathrm{m}$ long and $15 \mathrm{m}$ broad. It is to be paved with stones, each measuring $6 \mathrm{dm}$ by $5 \mathrm{dm}$. Find the number of stones required.

If the area of the square is $k {\mathrm{m}}^2$, the length of whose diagonal is $2.4 \mathrm{m}$, then find the value of $k$.

The area of the $4$ walls of a room is$77 {\mathrm{m}}^2$. The length and breadth of the room are$7.5 \mathrm{m}$ and $3.5 \mathrm{m}$ respectively. Find the height of the room.

The area of four walls of a room is$120 {\mathrm{m}}^2$. If the length of the room is twice its breadth and the height is$4 \mathrm{m}$, find the area of the floor.

A room is $8.5 \mathrm{m}$ long, $6.5 \mathrm{m}$ broad and$3.4 \mathrm{m}$ high. It has two doors, each measuring $\left(1.5 \mathrm{m} \mathrm{by} 1 \mathrm{m}\right)$ and two windows, each measuring $\left(2 \mathrm{m} \mathrm{by} 1 \mathrm{m}\right)$. Find the cost of painting its four walls at $₹160 \mathrm{per} {\mathrm{m}}^2$.