Circle

Q.

The longest chord of a circle is called a ___ of the circle.

1. sector

2. radius

3. segment

4. diameter

Q. If the radius of a circle is 12 cm, then the diameter of the circle will be

1. 4cm
2. 2cm
3. 4m

Q. The distance between any point on the circumference and centre of the circle is known as:

1. radius

Q.

What is the diameter, radius, and chord in a circle? Explain. Also, state the properties of chords of a circle. [4 MARKS]

Q. The minute hand of a clock is 10 cm long. Find the area on the face of the clock described by the minute hand between 9 A.M. and 9.35 A.M.
[ 4 MARKS ]

Q. The line joining the centre of a circle to any point on its circumference is called its .

1. radius of a circle
2. centre of a circle
3. diameter of a circle

Q.

How many vertex does a circle have?

Q. If radius of a circle is 7 cm, then its diameter is .

1. 14 cm
2. 10 cm
3. 8 cm

Q.

A circle has only one centre.

1. True

2. False

Q.

If diameter of a circle is 25 cm, then the measure of its radius = ___ cm.

1. 12.5

2. 12

3. 50

4. 25

Q.

Find the radius of a circle if the diameter is $21cm$

Q.

A circle divides the plane in ________ parts.

1. 3

2. zero

3. 1

4. 2

Q. The diameter of a circle is equal to:

1. Twice of its radius
2. Half of its radius
3. Half of its circumference
4. Twice of its circumference

Q.

The circumference of a circle of radius $r$ is given by ___.

1. $\pi r$

2. $2\pi r$

3. $4\pi r$

4. $\frac{\pi r}{2}$

Q.

Question 4(b):

Say true or false:
The centre of a circle is always in its interior

Q.

All diameters of a circle pass through its centre.

1. True

2. False

Q. The number of diagonals in a septagon is

1. 21
2. 42
3. 7
4. 14

Q.

A circle is a plane figure. Write True or False. Give reason for your answer

1. True
2. False

Q. A circle is:

1. a closed curve
2. an open curve
3. a polygon
4. not a simple curve

Q.

Diameter of the circle is ___________ the length of its radius.

1. half

2. thrice

3. same

4. twice

Q.

The diameter is ____ the length of the radius.

Q. If the radius of a circle is 7.5 cm, then its diameter is _____ cm.

1. 15

Q.

The region between an arc and the two radii joining the centre to the end points of the arc is called a ____.

1. Segment

2. Semi-circle

3. Chord

4. Sector

Q. If a bicycle wheel has 36 spokes, then find the angle between a pair of adjacent spokes.

Q.

How many diameters can a circle have?

Q.

All radii of a circle are ______________ .

Q. A closed figure whose points are equidistant from the center is called .

1. square
2. circle
3. rectangle

Q.

Two circles of radii 13 cm and 5 cm touch each other internally. The distance between their centres will be 8 cm.

1. 18 cm

2. 12 cm

Q. What is the region in the interior of a circle enclosed by a chord and an arc is known as?

1. Diameter
2. Segment
3. Radius
4. Sector

Q.

The triangle formed by the two radii, and a chord joining the endpoints of the same arc is called?

1. Isosceles triangle

2. Equilateral triangle

3. Right triangle

4. Scalene triangle