Content deleted Content added
m math markup |
Lifetrance (talk | contribs) m →Formulae: add name for missing term. |
||
Line 5:
== Formulae ==
Let ''R'' be the [[radius]] of the arc which forms part of the perimeter of the segment, ''θ'' the central angle subtending the arc in [[radian]]s, ''c'' the [[chord length]], ''s'' the [[arc length]], ''h'' the [[Sagitta (geometry)|sagitta]] ([[Height#In mathematics|height]]) of the segment, ''d'' the [[apothem]] of the segment, and ''a'' the [[area]] of the segment.
Usually, chord length and height are given or measured, and sometimes the arc length as part of the perimeter, and the unknowns are area and sometimes arc length. These can't be calculated simply from chord length and height, so two intermediate quantities, the radius and central angle are usually calculated first.
| |||