Circle-Circumference and Area

From a circular sheet of paper of radius $21 \mathrm{cm}$, three circles of radius $1.4 \mathrm{cm}$ and a square of side $5 \mathrm{cm}$ are cut out. Find the area of remaining sheet of paper.

 A circle of radius $3 \mathrm{cm}$ is cut out from a rectangular sheet of paper of dimensions $10\mathrm{cm} \times 11\mathrm{cm}$. What is the area of the leftover sheet of paper? (consider $\mathrm{\pi } = 3.14$)

A wire in the shape of a square is rebent to form a circle of area $154 {\mathrm{cm}}^2$. Find the length of the wire.

Find the area of a circle whose circumference is $100.48 \mathrm{cm}$. (Use $\pi = 3.14$)

A circular field is fenced with a fencing wire of length $396 \mathrm{m}$. The farmer wants to plant flower saplings in the garden which costs $50$ paise each. How much amount should he spend on the saplings, if he can plant $5$ saplings in $1 \mathrm{m}².$

The seconds hand of a circular clock is $19 \mathrm{cm}$ long. How far does the tip of the minute hand move in half an hour? (consider $\mathrm{\pi } = 3.14$)
 

How many times a wheel of radius $35 \mathrm{m}$ must rotate to go $1 \mathrm{km} 320 \mathrm{m}$.

Find the area of the largest circle that can be fitted in a square of side $4.2 \mathrm{cm}$.

Find the area of the following;

Circle: radius$=24.5 \mathrm{cm}$

Find the area and circumference of the following circles whose:

$d=4 \text{cm }\left(\text{use} \pi =3.14\right)$

Find the area and circumference of the following circles whose:

$r=10.5 \text{m}$

If the radius of a circle is tripled, then the area becomes:

Find the area and circumference of the following circles whose:

$d=21 \text{cm}$

Find the area and circumference of the following circles whose:

$r=3.5 \text{cm}$

The circumference of a circle whose area is $625{\mathrm{\pi r}}^2$ is:

Choose the correct option.

Circumference of a circle is always:

If the radius of a circular bangle is $14 \mathrm{cm}$, then what length of ribbon would be required to cover it fully along the circular portion?

The area of the ring formed by two concentric circles is $726 \mathrm{cm}²$. Find the area of the larger circle, if the perimeter of smaller circle is $44 \mathrm{cm}.$

Find the area of ring formed by two concentric circles whose inner radius is $7\mathrm{cm}$ and width of the ring is $7 \mathrm{cm}$.

A wire is bent in the form of a square of area $484 {\text{cm}}^2$. If it is rebent to form a circle, then find its diameter.