Chord Length Calculator
From Radius & Central Angle
From Radius & Distance to Center
From Radius & Sagitta
Formula
Chord = 2r*sin(theta/2) | Sagitta = r(1-cos(theta/2))
Frequently Asked Questions
How do you calculate chord length?
Chord = 2*r*sin(theta/2), where r is the radius and theta is the central angle in radians. Alternatively, chord = 2*sqrt(r^2 - d^2) where d is the distance from center to chord.
What is a sagitta?
The sagitta is the distance from the midpoint of a chord to the arc. Sagitta = r - sqrt(r^2 - (chord/2)^2), or equivalently r*(1-cos(theta/2)).
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