Acronym	10,n-dip
Name	decagon - n-gon duoprism
Circumradius	sqrt[(3+sqrt(5))/2+1/(4 sin2(π/n))]
General of army	(is itself convex)
Colonel of regiment	(is itself locally convex)
Face vector	10n, 20n, 11n+10, n+10
Especially	tradedip (n=3)   squadedip (n=4)   padedip (n=5)   hadedip (n=6)   odedip (n=8)   dedip (n=10)
Confer	general duoprisms: n,m-dip   2n,m-dip
External links

Incidence matrix according to Dynkin symbol

x10o xno   (n>2)

.  . . . | 10n |   2   2 | 1   4  1 | 2  2
---------+-----+---------+----------+-----
x  . . . |   2 | 10n   * | 1   2  0 | 2  1
.  . x . |   2 |   * 10n | 0   2  1 | 1  2
---------+-----+---------+----------+-----
x10o . . |  10 |  10   0 | n   *  * | 2  0
x  . x . |   4 |   2   2 | * 10n  * | 1  1
.  . xno |   n |   0   n | *   * 10 | 0  2
---------+-----+---------+----------+-----
x10o x . ♦  20 |  20  10 | 2  10  0 | n  *
x  . xno ♦  2n |   n  2m | 0   n  2 | * 10

x5x xno   (n>2)

. . . . | 10n |  1  1   2 | 1  2  2  1 | 2 1 1
--------+-----+-----------+------------+------
x . . . |   2 | 5n  *   * | 1  2  0  0 | 2 1 0
. x . . |   2 |  * 5n   * | 1  0  2  0 | 2 0 1
. . x . |   2 |  *  * 10n | 0  1  1  1 | 1 1 1
--------+-----+-----------+------------+------
x5x . . |  10 |  5  5   0 | n  *  *  * | 2 0 0
x . x . |   4 |  2  0   2 | * 5n  *  * | 1 1 0
. x x . |   4 |  0  2   2 | *  * 5n  * | 1 0 1
. . xno |   n |  0  0   n | *  *  * 10 | 0 1 1
--------+-----+-----------+------------+------
x5x x . ♦  20 | 10 10  10 | 2  5  5  0 | n * *
x . xno ♦  2n |  n  0  2n | 0  n  0  2 | * 5 *
. x xno ♦  2n |  0  n  2n | 0  0  n  2 | * * 5