The circumference of a circle is 2πr where r is the radius.
The area of a circle is πr² where r is the radius.
A complete circle is 2π radians. One radian is about 57.2957795 degrees, measured counterclockwise from due east. Java’s Math.sin and Math.cos etc. work in radians.
45 degrees = π/4 =
.775398 radians.
90 degrees = π/2 =
1.57079 radians.
180 degrees = π =
3.14159 radians.
360 degrees = 2π =
6.28318 radians.
The circumference of the outer curved part of a pieshaped wedge is θr where θ is the angle in radians and r is the radius.
The area of a pieshaped wedge is θr²/2 where θ is the angle in radians and r is the radius.
There are two convenience methods for interconverting degress and radians.
// builtin radians <> degrees methods. public static double toDegrees ( double angleInRadians ); public static double toRadians ( double angleInDegrees );
This page is posted 
http://mindprod.com/jgloss/pi.html  
Optional Replicator mirror

J:\mindprod\jgloss\pi.html  
Please read the feedback from other visitors,
or send your own feedback about the site. Contact Roedy. Please feel free to link to this page without explicit permission.  
Canadian
Mind
Products
IP:[65.110.21.43] Your face IP:[54.198.96.198] 
 
Feedback 
You are visitor number  