[size=150]This model is given by the interior points to a given circumference (the circle without the boundary). The hyperbolic points are the euclidean points of the circle, while a line between two points is given by an arc of circumference orthogonal to the boundary circumference.[br][br]By a point outside a "line" there are infinite parallels to it. Some properties, like the centers of a triangle, are preserved. While others, such as the Pythagorean Theorem, do not remain.[/size]