•−• ••−• −•−• •− ••−• • RF Cafe in Morse Code: Hear It
Geometry - Polygons
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 Triangle
(Pythagorean)
Equilateral Triangle
Rectangle
Parallelogram
General Quadrilateral
(Bretschneider's Formula)
Cyclic-Inscriptable Quadrilateral
Source: CRC Standard Math Tables, 1987
General Triangle
hc = length of altitude on side c, tc = length of bisector of angle C, mc= length of median to side c. (Law of Cosines) (Heron’s formula)
Rhombus
Trapezoid
Cyclic Quadrilateral
(Brahmagupta’s formula)
Regular Polygon
Note: Numbers shown are NOT total page views; they are unique IP addresses for each 24-hour period (i.e., unique visitors). Typical page view counts are at least twice the reported unique visitor number.
RF Cafe Erie, PA (814) 833-1967
A Disruptive Web Presence™ GPS Coordinates: N 42°04.577', W 080°11.757'
(Pythagorean)
Equilateral Triangle
Rectangle
Parallelogram
General Quadrilateral
General Triangle
(Law of Cosines)
(Heron’s formula)
Rhombus
Trapezoid
Cyclic Quadrilateral
Regular Polygon
