To Change Radians To Degrees
[1] Divide By 2π = 2(3.14 ... )
[2] Multiply By 360
To Change Degrees To Radians
[1] Divide By 360
[2] Multiply By 2π = 2(3.14 ... )
360 Degrees = 2π Radians
180 Degrees = π Radians
90 Degrees = π/2 Radians
45 Degrees = π/4 Radians
30 Degrees = π/6 Radians
60 Degrees = π/3 Radians
120 Degrees = 2π/3 Radians
150 Degrees = 5π/6 Radians
Arc Length = rθ
Where r is the radius
and θ is the angle at the centre of the circle
Sector Area = r2θ
Where r is the radius
and θ is the angle at the centre of the circle
Trigonometry - Radians
What is a radian?
The angle at the centre of a circle subtended (formed) by an arc
whose length is equal to the radius of the circle
| Demonstrations | ||
|---|---|---|
|
Radius length wrapping around a circle to form an angle of one radian
mathsisfun.com |
Radius bending to form the arc of an angle of one radian
id.mind.net |
This video shows what a radian is
and gives some common angles in radians
EXTERNAL LINKS
Short Demonstration
mathsisfun.com
Short Animation + Content
id.mind.net
Interactive Demonstration
With Questions
wisc-online.com
Worksheets
teachnet-uk.org.uk
Definition Of Radian
thesaurus.maths.org
Definition Of Radian
mathworld.wolfram.com
Degrees/Radian Converter
diracdelta.co.uk
Online Multi-Converter
convertcenter.com
Radian Topics
themathpage.com
Radian Resources
mathcentre.ac.uk