Copyright
1996 
2016
Webmaster:
Kirt
Blattenberger,
BSEE  KB3UON
RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The Internet was still largely an unknown entity at the time and not much was available in the form of WYSIWYG ...
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AirplanesAndRockets.com
Circumference
and Area

Ellipse (approx) 
Sector
of an Annulus 
Sector
and Segment 
Parabolic
Segment K (right segment) K (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. 