Circumference of a Circle

Q.

Question 16

How many times must a wheel of radius 28 cm rotate to go 352 m?
$(Take\pi =\frac{22}{7})$

Q.

Find the distance covered by a 7cm long minute hand of a clock in an hour.

Q.

Question 17
The minute hand of a circular clock is 15 cm long. How far does the tip of the minute hand move in 1 hour?
$(Take\pi =3.14)$

Q.

If circumference and area of a circle are numerically equal, then the diameter of the circle is 4 units.

1. True

2. False

Q.

The circumference of a circle whose radius is 3.5 cm is ___ cm

Q. The diameter of the wheel of a cycle is 70 cm. Find the distance covered by the wheel in 24 complete revolutions.

1. 5820 cm
2. 5280 cm
3. 5028 cm
4. 5082 cm

Q. The minute hand of a circular clock is 14 cm long. How far does the tip of the minute hand move in 1 hour?
$(Take\pi =\frac{22}{7})$

1. 56 cm
2. 66 cm
3. 84 cm
4. 88 cm

Q. Find the perimeter of a semicircle whose diameter is 14 cm.

1. 21 cm
2. 22 cm
3. 36 cm
4. 44 cm

Q.

The moon is about $384000km$ from the earth and it's path around the earth is nearly circular. Find the circumference of the path described by the moon in one complete revolution about the earth (use $\pi =3.14$)

Q.

Question 109

How much distance, in metres, a wheel of 25 cm radius will cover, if it rotates 350 times?

Q. If the perimeter of a semi circle is 144 cm, what is its area?

1. $1232c{m}^2$
2. $1223c{m}^2$
3. $1322c{m}^2$
4. $1323c{m}^2$

Q.

Find the area of a quadrant of a circle whose radius is $14cm$.

Q. The distance around a circular region is known as its _____________ .

1. area
2. circumference
3. perimeter
4. radius

Q. If a circular wire of radius 7 cm is bent into the shape of a square, then what will be the area of the square?

1. $49{\text{cm}}^2$
2. $81{\text{cm}}^2$
3. $121{\text{cm}}^2$
4. $196{\text{cm}}^2$

Q. A circle is cut into 16 equal sectors and the sectors are arranged as shown below.


The given figure can be visualised as:

1. Rectangle
2. Square
3. Hexagon
4. None of these

Q.

Question 15
Find the circumference of the inner and the outer circles, shown in the adjoining figure.
$(Take\pi =3.14)$

Q. What is the circumference of a circle of diameter 10 cm? (Take π = 3.14)

1. 314 cm
2. 31.4 cm
3. 3.14 cm
4. 3.41 cm

Q.

How to measure the circumference of a drawn circle using a thread

Q.

Question 98

Find the area of the shaded region:

Q.

The driving wheel of a locomotive engine is $2.1m$ radius. Find the distance covered when it has made $8000$ revolution

Q.

The diameter of a scooter wheel is 49 cm. How many revolutions will it make in covering 616 m ? (Take $\pi =\frac{22}{7}$)

1. 24:36

2. 25:37

3. 26:37

4. 25:36

Q.

The ratio of the circumference of a circle to its diameter is denoted by the symbol ______.

Q.

Circumference of a circle disc is $88\mathrm{cm}$. Its radius is -

1. $8\mathrm{cm}$

2. $11\mathrm{cm}$

3. $14\mathrm{cm}$

4. $44\mathrm{cm}$

Q. Question 19

Circumference of a circle of diameter 5 cm is

(a) 3.14 cm
(b) 31. 4 cm
(c) 15.7 cm
(d) 1.57 cm

Q.

A carriage wheel makes 1500 revolutions in going over a distance of 4.5 km. Find its radius.

Q.

Find the radius of a circle if its circumference is $308cm$.

Q.

Find the circumference of the circle with the following radius: $(\text{Take}\pi =\frac{22}{7})$

$14cm$

Q.

The wheels of a car are of diameter $80\text{cm}$ each. How many complete revolutions does each wheel make in $10\text{minutes}$ when the car is travelling at a speed of $\text{66 km/h}$ ?

Q.

Choose the correct answer

The length of the longest chord of a circle of radius $2.6cm$ is ______

1. $1.3cm$

2. $4.3cm$

3. $8.2cm$

4. $5.2cm$

Q. The circumference of a circle with a diameter of 2 units is ________.

1. 2$\pi$ units
2. 4$\pi$ units
3. 8$\pi$ units
4. $\pi$ units