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What is One radian ? Relationship Between Degree and Radian Geometrically ProofItsMyAcademy.com

What is One radian ? Relationship Between Degree and Radian Geometrically Proof

If we are going to learn about angles then we must know about the unit of measuring angles.There are many units to measure angles like degree, grade, radian etc. Radian is Standard Unit (SI unit) of measuring plane angle.  So it is very necessary to know the definition of one radian, how we have definite the unit of angle. The unit of angle – one radian is define as

One Radian

The  angle formed at center of the circle by an  arc equal to its radius.

Angle = Arc / Radius

1 Radian = Arc equal to radius/ Radius = 1

In the following  video, addition to definition of one radian we derive the relationship between the two units of angles degree and radian.We get the relation as

Pi Radian = 180 degree.

With the help of this relation between degree and radian we can easily convert the angle value given in radian into degree as well as angle value given in degree into radian. There is a small example too given in this video. I hope you will learn something from this video. Please dont forget to put your comment below.


  • ahmad

    Hi brother, I would like to teach Arabic on the internet. May ask you what is the name of the device and what software you are using. i would be very grateful if you please let me know.
    best regards
    my email address is:

  • ItsMyAcademy.com

    I am using pen tablet, smooth draw and camstesia for making these videos

  • ankan

    thak you ……
    it was very helpful