Circle Sector, Segment, Chord and Arc Calculator Scroll to the
bottom for the Circle Calculator Click here for the formulas
used in this 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 blue line AB
is called an arc. Line OE is the apothem and is the height of
triangle AOB. Line ED is the segment height or the sagitta - a
rarely-used term. The length of an arc equals (Central Angle /
180°) The yellow area that resembles a "pizza slice" is a
sector. The area of a sector equals (Angle AOB / 360°) π r² The
green area (Circle Two) is a The area of a segment equals Minus
Triangle AOB Area RETURN TO GEOMETRY Numbers are displayed in
scientific notation in the amount of significant figures you
specify. For easier readability, numbers between 1,000 and
-1,000 will not be in scientific notation but will still have
the same precision. You may change the number of significant
figures displayed by changin