abstract:In hyperbolic geometry, the angle of parallelism φ, also known as Π(p), is the angle at one vertex of a right hyperbolic triangle that has two asymptotic parallel sides. The angle depends on the segment length a between the right angle and the vertex of the angle of parallelism φ.
Generalsideboxforpartsparallelism, perpendicularityandtesting and marking, universal side boxesdesignated for inspectionorprecisionof theworkpieceat anyAngleline.