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About RF Cafe

Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024
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 World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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Geometry - Polygons
In geometry a polygon is traditionally a plane figure that is bounded by a closed path or circuit, composed of a finite sequence of straight line segments (i.e., by a closed polygonal chain). These segments are called its edges or sides, and the points where two edges meet are the polygon's vertices or corners. The interior of the polygon is sometimes called its body. A polygon is a 2-dimensional example of the more general polytope in any number of dimensions.

The word "polygon" derives from the Greek πολύς ("many") and γωνία (gōnia), meaning "knee" or "angle". Today a polygon is more usually understood in terms of sides. - Wikipedia

    K = area
    r= radius of inscribed circle
    R = radius of circumscribed circle
    p and q are diagonals
    n= number of sides
    θ = one of the vertex angles

Right TriangleRight triangle - RF Cafe

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Equilateral Triangle

Equilateral triangle - RF Cafe - RF Cafe
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Rectangle

Rectangle - RF Cafe - RF Cafe
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Parallelogram

Parallelogram - RF Cafe - RF Cafe
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General Quadrilateral

General quadrilateral - RF Cafe - RF Cafe
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Cyclic-Inscriptable Quadrilateral

Cyclic inscriptable quadrilateral - RF Cafe - RF Cafe
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General Triangle

General triangle - RF Cafe - RF Cafe
hc = length of altitude on side c,
tc = length of bisector of angle C,
mc = length of median to side c.



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- RF Cafe (Heron's formula)

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Rhombus

Rhombus - RF Cafe - RF Cafe
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Trapezoid

Trapezoid - RF Cafe - RF Cafe
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Regular Polygon

Regular polygon - RF Cafe - RF Cafe
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Cyclic Quadrilateral

Cyclic quadrilateral - RF Cafe - RF Cafe
- RF Cafe   (Brahmagupta's formula)

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Source: CRC Standard Math Tables, 1987
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