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
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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
changing the number in the box above.
Most browsers, will display the answers properly but
if you are seeing no answers at all, enter a zero in the box above, which will
eliminate all formatting but at least you will see the answers.
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