To initial, plot and show a Sierpinski triangles.

1 | ```
st(A,B)
``` |

`A,B` |
The degrees of two of the three angles of a triangle. |

When the original triangle is an acute triangle,
the area of the smallest ST to be drawn is determined by (tol * S),
where S is the total area for plotting. No restriction is applied to `iter`

.

If the original triangle is an obtuse triangle,
the largest value of `iter`

is 12.

tol: A stopping creiteria to draw the sub-SPT. Default value 0.0001.

The dimension of the ST will be returned if the original triangle is an acute triangle.

B. Wang bwang@jaguar1.usouthal.edu

Zhang, XM., Hitt, R. Wang, B. and Ding, J. (2008). Sierpinski Pedal Triangle. Fractals. 16(2): 141-150.

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