Tamil Nadu Board Solutions for Chapter: Measurements, Exercise 5: Exercise 2.2

A sprinkler placed at the centre of a flower garden sprays water covering a circular area. If the area watered is $1386 {\mathrm{cm}}^2$, find its radius and diameter.

Find the length of the rope by which a bull must be tethered in order that it may be able to graze an area of $2464 {\mathrm{m}}^2$.

(Note: Find the answer in $\mathrm{m}$ and enter only the numerical part in the blank)

Lalitha wants to buy a round carpet of radius is $63 \mathrm{cm}$ for her hall. If the area covered by the carpet is $\mathrm{A} {\mathrm{cm}}^2$ then find the value of $\mathrm{A}$.

Thenmozhi wants to level her circular flower garden whose diameter is $49 \mathrm{m}$ at the rate of $₹150$ per ${\mathrm{m}}^2$. If the cost of levelling is $₹k$, find $k$.

The floor of the circular swimming pool whose radius is $7 \mathrm{m}$ has to be cemented at the rate of $₹18$ per ${\mathrm{m}}^2$. If the total cost of cementing the floor is $₹\mathrm{A}$ then find the value of $\mathrm{A}$.

The formula used to find the area of the circle is            $\mathrm{sq}.\mathrm{units}$. 

The ratio of the area of a circle to the area of its semicircle is

Area of a circle of radius $\text{'}\mathrm{n}\text{'}$ units is