We at **ask-math **believe that educational material should be free for everyone. Please use the content of this website for in-depth understanding of the concepts. Additionally, we have created and posted videos on our youtube.

**We also offer One to One / Group Tutoring sessions / Homework help for Mathematics from Grade 4th to 12th for algebra, geometry, trigonometry, pre-calculus, and calculus for US, UK, Europe, South east Asia and UAE students.**

**Affiliations with Schools & Educational institutions are also welcome.**

Please reach out to us on [email protected] / Whatsapp +919998367796 / Skype id: anitagovilkar.abhijit

We will be happy to post videos as per your requirements also. Do write to us.

A

Part |
Description |
Example |
Properties |

Center | A point in a plane from which all points on the circle are equidistant | O is the center |
A circle can have only one center |

Radius | A line segment with one end point at the center and other end point on the circle |
OP is a radius |
The radius is always half the diameter R = d/2. A circle can have an infinite radii. (plural of radius) |

Diameter | A chord that passes through the center of a circle. | AB is a diameter. |
A diameter is twice the radius d = 2r. It is always passes through the center. It is the longest chord of a circle. |

Circum- ference |
The length of a boundary of a circle. | O is the center |
Every point on the circumference is equidistant from the center. |

Chord | A line segment whose end points are on the circle. | PQ is a chord. |
A chord can be of any length.It may or may not pass through the center. Diameter is the longest chord. |

Arc | A part of a circle between any two points on the circle. | PQR is an arc. |
It can be of any length. The bigger arc is called major arc and the smaller arc is called minor arc. |

Segment | A chord divides a circle into two parts called segments. | PQR is an arc. |
PQR is a minor segment . RSP is the major segment. |

Sector | The region enclosed by two radii and an arc. | sector AOB |
The smaller sector is called minor sector and the bigger sector is called major sector. |

Semicircle | Half circle. | Diameter of a circle divides it into two semicircles. |

• Circles

• Parts of -Circle

• Arc and Chords

• Equal Chords

• Arc and Angles

• Cyclic Quadrilaterals

• Tangent

GMAT

GRE

1st Grade

2nd Grade

3rd Grade

4th Grade

5th Grade

6th Grade

7th grade math

8th grade math

9th grade math

10th grade math

11th grade math

12th grade math

Precalculus

Worksheets

Chapter wise Test

MCQ's

Math Dictionary

Graph Dictionary

Multiplicative tables

Math Teasers

NTSE

Chinese Numbers

CBSE Sample Papers