triangle(x1, y1, x2, y2, x3, y3)
Draws a triangle to the page. The first two arguments specify the first point, the middle two arguments specify the second point, and the last two arguments specify the third point.
Type: function
Parameter(s):
- x1 {Number}:
X-coordinate of Point 1.
 - y1 {Number}:
Y-coordinate of Point 1.
 - x2 {Number}:
X-coordinate of Point 2.
 - y2 {Number}:
Y-coordinate of Point 2.
 - x3 {Number}:
X-coordinate of Point 3.
 - y3 {Number}:
Y-coordinate of Point 3.
 
Returns:
- 
    {Polygon}:
The new triangle as a Polygon object.