O P Malhotra, S K Gupta and, Anubhuti Gangal Solutions for Chapter: Perimeter and Area, Exercise 8: Exercise

Finding the area of shape correct to one decimal place, we get $k c{m}^2$. $($Use $3.14$ for $\mathrm{\pi })$

Write the value of $k$.

Find the area of the shaded portion in ${\mathrm{cm}}^2$.

Covers for cans are stamped out of sheets of metal. How many square centimetres of waste material is there, when the covers are cut from a square $5 \mathrm{c}\mathrm{m}$ wide? $$$($Use $3.14$ for $\mathrm{\pi })$

The given figure shows $4$ identical quadrants in a square. If the area of the shaded part is  $k {\mathrm{cm}}^2$, then find the value of $k$.(Take $\mathrm{\pi }=3.14)$

A road $3.5 \mathrm{m}$ wide surrounds a circular plot whose circumference is $44 \mathrm{m}$. Find the cost$\left(\mathrm{in} \mathrm{₹}\right)$ of paving the road at $\mathrm{₹} 20$ per ${\mathrm{m}}^2$. $\left(\mathrm{Take} \mathrm{\pi }=\frac{22}{7}\right)$

A sheet of metal has dimensions $56 \mathrm{c}\mathrm{m}$ by $33 \mathrm{c}\mathrm{m}$. It is melted down and recast into discs of the same thickness and radius $7 \mathrm{c}\mathrm{m}$. How many discs will be cast?

The area of two equal circles in the figure is $308 \mathrm{c}{\mathrm{m}}^2$. Find the area of the rectangle in ${\mathrm{cm}}^2$.

The figure given alongside shows two identical semi-circles enclosed in a circle. The diameter of the circle is $28 \mathrm{c}\mathrm{m}$. The distance between the two semi-circles is $8 \mathrm{c}\mathrm{m}$. Find the area of the shaded part in ${\mathrm{cm}}^2$. $\left(\mathrm{T}\mathrm{a}\mathrm{k}\mathrm{e} \mathrm{\pi }=3.14\right)$