Circumference of a Circle

Q.

Find the circumference of the circle with a radius of $14cm$ by taking $\pi =\raisebox{1ex}{$22$}\!\left/ \!\raisebox{-1ex}{$7$}\right.$.

Q.

Find the circumference of the circle with a radius of $21cm$ by taking $\pi =\raisebox{1ex}{$22$}\!\left/ \!\raisebox{-1ex}{$7$}\right.$.

Q. Use the figure alongside to fill in the blank:
is a radius of the circle.

Q.

The short and long hand of a clock are $4\mathrm{cm}$ and $6\mathrm{cm}$ respectively. Find the sum of distances travelled by their tips in one day.

Q. The number of revolutions made by a bicycle wheel 56 cm in diameter in covering a distance of 1.1 km is

1. $31.25$
2. $625$
3. $312.5$
4. $62.5$

Q.

A car has a tyre of diameter 28 cm. ___ km is covered by the car if the tyre rotates 150 times.

$(Use\pi =\frac{22}{7})$

Q. Find the circumference of a circle whose radius is equal to 7 cm. $(\pi =\frac{22}{7})$

1. 49 cm
2. 44 cm
3. 7 cm
4. 22 cm

Q.

Use the figure alongside to fill in the blank:

Diameter of the circle is _______.

Q. What is the circumference of a circle of diameter $1.4cm$. (Use $\pi =\frac{22}{7}$)

1. $4.4cm$
2. $5.6cm$
3. $8.8cm$
4. $6.6cm$

Q.

Find the radius of the button.

Q. Match the following wheels of different sizes with the number of rotations to cover a distance of 440 m.

1. 20
2. 10
3. 5
4. 4

Q.

A car has to travel 0.121 km to reach from A to B. If the radius of the tyre is 7 cm. How many times will the tyre rotate while the car travels from A to B?

$(Use\pi =\frac{22}{7})$

___

Q.

How many pieces of 1/5 yd of rope can be cut out from 5 yd of rope?

1. 5
2. 10
3. 25
4. 20

Q. A piece of cloth is $5m$ long. After washing it shrinks by $\frac{1}{25}$ of its length. What is the length of the cloth after washing?

Q. The diameter of semi circular field is $49$ m. What the cost of fencing the plot of Rs. $10$ per metre?

1. Rs. $1259.3$
2. Rs. $1260$
3. Rs. $1250$
4. None

Q. If the radius of a circle is 7 cm, what is its area?

1. 154 sq. cm
2. 144 sq. cm
3. 120 sq. cm
4. 132 sq. cm

Q.

If circumference and area of a circle are numerically equal, how long is its diameter?

1. 2

2. 8

3. $2\pi$

4. 4

Q. 10 rungs are needed for designing a ladder. If 12/5 yd length of wood is cut into 12 parts, the length of each rung is .

1. $\frac{1}{5}$ yd

2. $\frac{1}{4}$ yd

3. $\frac{1}{3}$ yd

Q. If base and height of the given shapes measures same length then which of the shape has greater perimeter.

1. (1)
2. (2)
3. Both equal
4. Can't say

Q. If the radius of a circle is 7 cm, what is its area?

1. 154 sq. cm
2. 144 sq. cm
3. 120 sq. cm
4. 132 sq. cm

Q. A boy makes one round along the boundary of a rectangular field in 20 minutes.The field is 160 m long and 124 m wide.Find-
(1) The perimeter of the field?
(2) The distance moved by the boy?
(3) The speed (in ms-1) at which the boy runs?

Q.

You have to make two side rails for a ladder from 18/4 m of timber. What would be the length of each side rail?

1. $\frac{18}{8}$ m
2. $\frac{18}{6}$ m
3. $\frac{8}{18}$
4. $\frac{10}{18}$

Q. How do you find the perimeter of a 3/4 circle?