Three equal circles, each of radius $2 \mathrm{cm}$ touch one another. If the area enclosed in between them is $k {\mathrm{cm}}^2$, find $k$ upto two decimal places. [Take $\sqrt{3}=1.732, \mathrm{\pi }=3.14$]

A horse is tethered to a corner of a field which is of the shape of an equilateral triangle. The length of the rope by which it is tied by is $7 \mathrm{m}$. If the area of the field over which it can graze, corrected up to two decimal places is $k {\mathrm{cm}}^2$, then find the value of $k$ considering $\pi =\frac{22}{7}$.

A sector is cut from a circle of diameter $21 \mathrm{cm}.$ The angle of the sector is $150°$. If the area of the sector is $k {\mathrm{cm}}^2$, find the value of $k$ considering $\mathrm{\pi }=\frac{22}{7}$.( write the answer in decimals)

Flowers are to be planted in the shaded portion which is shown by sectors of two concentric circles of radii $14 \mathrm{m}$ and $7 \mathrm{m}$. If the area of the shaded region is $k {\mathrm{m}}^2$, then find the value of $k$.  $\left(\pi =\frac{22}{7}\right)$

The radius of a circle is $28 \mathrm{cm}$ and the area of the sector is $205.4 {\mathrm{cm}}^2$. If the central angle is $k°$ then find $k$ considering $\pi =\frac{22}{7}$.   [Write the value of $k$ only up to the decimal point]

An umbrella has $8$ ribs which are equally spaced. Assuming umbrella to be a flat circle of radius $45 \mathrm{cm}$. If the area between the two consecutive ribs of the umbrella is $k {\mathrm{cm}}^2$ then find $k$, correct upto one decimal place. [Assume $\mathrm{\pi }=\frac{22}{7}$]