Prakash Tiwari and Ishita Joshi Solutions for Chapter: Mensuration, Exercise 3: Let's Practice

Find the cost of cementing a wall of length $14 m\times 11 m$ which is provided with spaces for a door of dimension $4 m\times 2.8 m$ and a window of dimension $1.5 m\times 1.2 m$ at the rate of $₹5.75 per m^2$

A wire which is bent in the shape of a square of area $49 c{m}^2$ is rebent to form a rectangle of breadth $4 cm$. Find the area of rectangle formed on rebending the wire. Also, find which shape occupies more area and by how much.

Area of a rectangle is same as that of a square of perimeter $56 cm$. Find the perimeter of the rectangle, if its breadth is $7 cm$.

Find the area of the rectangle whose perimeter is $154 cm$ and whose length and breadth are in the ratio of $4:3$

If breadth of a rectangle is one-third of its length and its area is $27 c{m}^2$, then find its perimeter.

If a square has side $a$, then what wil be its perimeter if the side is doubled?

If a hall has area $200 sq m$ and $15$ square carpets of side $2 m$ are to be placed in the hall, then how much area would remain uncovered?

The floor of a room $5 m$ long and $6 m$ wide is to be covered by square tiles. If each square tile is $50 cm$ long, then find the number of tiles required to cover the floor. Also, find the cost of tiling at the rate of $₹4.5$ per tile.