All About Circles
Mathematics
 Basic Concepts about Circles
1. A circle is defined as:

It consists of union of all the points which lie on a plane at a constant distance from a fix point known as its centre.
It consists of union of all the points which lie in a circle at a constant distance from a fix point known as its centre.

2. A single line inside a circle joining any two points at the circumference of the circle can be:

a. b & c are correct
b. Chord
c. Diameter
d. Radius

3. Which statement represents the elements of a circle:

Radius, Radical sign, Chord and Diameter
Radius, Radical sign, Chord and Perimeter
Radius, Perimeter, Chord and Diameter
Perimeter, Chord and Diameter

4. A straight line extending from the centre of a circle to its  circumference is called:

Radius
Radical sign
Chord
Arc

5. The distance around the edge of a circle is:

Circumference
Radius
Radical sign
Chord

6. A straight line connecting two points on an arc or circle is:

Chord
Line
Diameter
Radius

7. Line AB in the diagram is representing:


 

 


Chord
Line
Diameter
Radius

8. In the given diagram Line PQ in the represents:

 

 



Diameter
Radius
Arc
Chord

9. A straight line inside a circle running from one side of circle passing through the centre and joining with other side of the circle, while remaining inside:

Diameter
Radius
Arc
Chord

10. The length of diameter of a circle is twice of its:

Radius
Arc
Chord
Segment

11. An Arc is:

d. All are correct
a. A curved line
b. A semicircular line
c. A section of a circle

12. All the radial segments in a circle are equal:

True
False

13. All the radical segments in a circle are equal is the definition of:

Circumference
Diameter
Radius
Arc

14. In the diagram yellow area is called:


 

 

Sector
Segment
Arc
Triangle

15. Region of a circle bounded by two radial segments (radius lines) and an arc is called:


 


Sector
Triangle
Segment
Arc

16. The diagram below shows a red portion of a circle which is called as:


 

 

Arc
Sector
Radius
Segment

17. In the diagram the straight line is called:


 

 

a. Answer b and c are correct
b. Radius
c. Arc
d. Chord

18. A minor arc is an arc of a circle having measure less than or equal to:

c. Answer d and b are correct
d. 180o
b. p radians
d. 360o

19. A major arc is an arc of a circle having measure greater than or equal to :

180o
360o
45o
90o

20. ________ is a unit of angular measurement equivalent to the angle between two radius lines that enclose a section of a circle’s circumference (arc) equal in length to the length of a radius:

Radian
Radius
Radical
Arc Length

21. Radian is a unit of measuring :

Click here to enter your answer!
22. There are ____ radians in a circle:

2
3
4
6

23. One radian is equal to:

180o
360o
45o
90o

24. Identify the types of  arcs shown in diagram:

 


 

 


Minor, Major
Major, Minor
Main, Minor
Minor, Main

25. The difference between a semicircle and arc is:

Semicircle is always half of a circle or 180o and arc may be of any angle up to 360°
There is no difference between semicircle and arc


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