Types/Turtle/ArcLeft.ps1

<#
.SYNOPSIS
    Arcs the turtle to the left
.DESCRIPTION
    Arcs the turtle to the left (counter-clockwise) a number of degrees.

    For each degree, the turtle will move forward and rotate.
.NOTES
    The amount moved forward will be the portion of the circumference.
#>

param(
# The radius of a the circle, were it to complete the arc.
[double]
$Radius = 10,

# The angle of the arc
[double]
$Angle = 60
)

# Rather than duplicate logic, we will simply reverse the angle
$angle *= -1
# and arc to the "right".
return $this.ArcRight($Radius, $Angle)