Acronym stardedip Name pentagram - decagon duoprism Circumradius sqrt[(10+2 sqrt(5))/5] = 1.701302 Dihedral angles at {5/2} between stip and stip:   144° at {4} between dip and stip:   90° at {10} between dip and dip:   36° Confer n/d,m/b-dip Externallinks

Incidence matrix according to Dynkin symbol

```x5/2o x10o

.   . .  . | 50 |  2  2 |  1  4 1 |  2 2
-----------+----+-------+---------+-----
x   . .  . |  2 | 50  * |  1  2 0 |  2 1
.   . x  . |  2 |  * 50 |  0  2 1 |  1 2
-----------+----+-------+---------+-----
x5/2o .  . |  5 |  5  0 | 10  * * |  2 0
x   . x  . |  4 |  2  2 |  * 50 * |  1 1
.   . x10o | 10 |  0 10 |  *  * 5 |  0 2
-----------+----+-------+---------+-----
x5/2o x  . ♦ 10 | 10  5 |  2  5 0 | 10 *
x   . x10o ♦ 20 | 10 20 |  0 10 2 |  * 5
```

```x5/2o x5x

.   . . . | 50 |  2  1  1 |  1  2  2 1 | 1 1 2
----------+----+----------+------------+------
x   . . . |  2 | 50  *  * |  1  1  1 0 | 1 1 1
.   . x . |  2 |  * 25  * |  0  2  0 1 | 1 0 2
.   . . x |  2 |  *  * 25 |  0  0  2 1 | 0 1 2
----------+----+----------+------------+------
x5/2o . . |  5 |  5  0  0 | 10  *  * * | 1 1 0
x   . x . |  4 |  2  2  0 |  * 25  * * | 1 0 1
x   . . x |  4 |  2  0  2 |  *  * 25 * | 0 1 1
.   . x5x | 10 |  0  5  5 |  *  *  * 5 | 0 0 2
----------+----+----------+------------+------
x5/2o x . ♦ 10 | 10  5  0 |  2  5  0 0 | 5 * *
x5/2o . x ♦ 10 | 10  0  5 |  2  0  5 0 | * 5 *
x   . x5x ♦ 20 | 10 10 10 |  0  5  5 2 | * * 5
```