Custom Search
More than 8,000 searchable pages indexed.

Your RF Cafe
Progenitor & Webmaster

Click here to read about RF CafeView the YouTube RF Cafe Intro VideoKirt Blattenberger ... single-handedly redefining what an engineering website should be.

Carpe Diem!
(Seize the Day!)

5th MOB:
My USAF radar shop

Airplanes and Rockets:
My personal hobby website

Equine Kingdom:
My daughter Sally's horse riding website

•−•  ••−•    −•−•  •−  ••−•  •
RF Cafe Morse Code >Hear It<

Job Board

About RF Cafe™


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)

Circumference of a Circle - RF CafeCircumference and Area


Circumference of an Ellipse - RF CafeEllipse


Circumference of an Annulus - RF CafeSector of an Annulus


Sector and Segment - RF CafeSector and Segment


Parabolic Segment - RF CafeParabolic Segment

K (right segment)

3D Parabolic Segment - RF CafeK (oblique segment) , where T is the area of the triangle
with 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