Relation between Circumference and Diameter

Q.

The circumference of a circle of diameter 10 cm is _____.

1. 3.14 cm

2. 0.314 cm

3. 314 cm

4. 31.4 cm

Q.

How many times a wheel of radius 28 cm must rotate to go 352 m?

(Take π )

Q. The the length of an arc is if it subtends an angle of ${60}^{\circ }$ at the centre of a circle with radius 42 cm.

1. 44 cm
2. 66 cm
3. 52 cm

Q. Complete the table below

Sr. No.	Radius (r)	Diameter (d)	Circumference (c)
(i)	7 cm	....................	.................
(ii)	............	28 cm	..............
(iii)	..............	...............	616 cm
(iv)	...........	.............	72.6 cm

Q.

Find the cost of polishing a circular table-top of diameter $1.6m,$ if the rate of polishing is $Rs.15$ per $m^2$. (Take $\pi =3.14$)

Q.

A Hacksaw Blade Is Specified by Its

1. Length

2. Width

3. Material

4. None of the above

Q.

The number of circles that can be drawn with a given centre is

1. 2

2. 3

3. 1

4. As many as we want

Q. The perimeter of a wheel of a size of a car is 70 cm. How much distance will it cover in 50 revelution.

Q.

How many circles can be drawn with a given point as centre?

Q.

The circumference of a circular garden is 66 m find its diameter

Q. The longest chord of a circle is 20 cm. Find the circumference of the circle.
(Take π = 3.14)

1. 65.5 cm
2. 70.6 cm
3. 67.2 cm
4. 62.8 cm

Q.

State whether statement is true or false:

The length of all radii of a circle are different.

1. True
2. False

Q.

The diameter of a wheel is $1.26cm$. What is the distance covered in $500$ revolution.

Q.

The radius of a cycle wheel is 35 cm. What is the number of turns required to cover a distance of 1540 m?

1. 800
2. 900
3. 600
4. 700

Q.

Circumference C of a circle can be found by multiplying diameter d with ___.

Q. The circumference of a circle is eight times the circumference of the circle with radius 12 cm. Find its diameter

Q.

The circumference of a circle is 440 cm .Find its radius and diameter.(take pictures =22/7)

Q.

The circumference of the circle with radius 0.6 cm and π = 3.14 is _______

1. 3.258 cm

2. 2.689 cm

3. 3.768 cm

4. 2.149 cm

Q. Saili plants 4 saplings in a row, in her garden. The distance between two adjacent saplings is $\frac{3}{4}m.$ Find the distance between the first and the last sapling.

Q. If the length of the seconds hand of a clock is 7 cm, then find the distance covered by its tip in 1 minute.

1. 14 cm
2. 44 cm
3. 84 cm
4. 50 cm

Q.

Find the diameter of circles whose circumference is

(1) 22 cm

(2) 44 cm

(3) 8.8 cm

(4) 13.2 cm

Q. If the ratio of circumference of two circles is 5:7, then the ratio of its diameters is _____

1. 7:5
2. 5:7
3. 25:49
4. 10:49

Q.

A car has a tyre of diameter 28 cm. ___ km is covered by the car if the tyre rotates 150 times. (Use $\pi$ = 22/7)

Q. A race track is in the form of a ring whose inner circumference is 352 m, and the outer the circumference is 396 m. Find the width of the track.

Q. The ratio of the diameters of two circles is 2:3. What is the ratio of their circumferences?
(2 marks)

Q. The radius of the driving wheel of an engine is 1.75 how many revolution will it make in travelling 22km

Q. Find the circumference of the jogging track when two semicircles are joined at the edges of the rectangle as shown. (Take π = 3.14)

1. 35.7 cm
2. 34.5 cm
3. 38.9 cm
4. 36.6 cm

Q. Find the distance travelled by the minute hand(length of arc), in 15 minutes if its length is 7 cm.

1. 10 cm
2. 11 cm
3. 14 cm
4. 21 cm

Q.

The diameter of a cart wheel is $1.4\mathrm{m}$. Find the distance to which the cart moves when wheel makes $1000$ revolutions.

Q.

Find the circumference of the circles with the following radius: (Takeπ)

(a) 14 cm (b) 28 mm (c) 21 cm