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Geometry - Arcs & Circles
Here are formulas for some of the most commonly used arcs and circles. Equations for area and circumference are provided.
K = area
R = radius
D = diameter
C = circumference
θ = central angle (radians)
Source: CRC Standard Math Tables, 1987
K = area
R = radius
D = diameter
C = circumference
θ = central angle (radians)
 Circumference and Area    |
 Ellipse (approx) |
 Sector of an Annulus    |
 Sector and Segment          |
 Parabolic SegmentK (right segment)    K (oblique segment)  , where T is the area of the trianglewith the base along the chord of the segment and with opposite vertex at the point on the parabola at which the tangent to the parabola is parallel to the chord of the segment. |
Source: CRC Standard Math Tables, 1987
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