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Circle Sector, Segment, Chord and Arc Calculator

Lines AO and OB are called radii.
Lines AC, BC and AB are called chords.
The angle ACB is an inscribed angle.
The angle AOB is a central angle.
The curved line AB is called an arc.
Line OE is the apothem and is the height of triangle AOB.
Line ED is the segment height

Click on the 2 variables you know

Radius and Central Angle    Radius & Chord
  Radius & Segment Height     Radius & Apothem
  Chord & Segment Height      Chord & Apothem     Segment Height & Apothem

Significant Figures 

e+ or e- Refers to Exponential Notation 
For Example: 4.5 e+3 is the same as 4,500