Hyperbolic geometry or hypercycle, then the triangle has no circumscribed circle. As in spherical and elliptical geometry, in hyperbolic geometry if two triangles are similar, they must be congruent. A special polygon in hyperbolic geometry is the regular apeirogon, a uniform polygon with an infinite number of sides. In Euclidean geometry, the only way to construct such a polygon is to make the side lengths tend to zero and the apeirogon is indistinguishable from a circle, or make the interior angles tend to 180 degrees and the apeirogon approaches a straight line. However, in hyperbolic geometry, a regular apeirogon has sides of
OMB Circular A-123 OMB Circular A-123 OMB Circular A-123 is a US Office of Management and Budget (OMB) Government circular that defines the management responsibilities for internal controls in Federal agencies. It was first issued in 1981 by OMB's Office of Federal Financial Management and underwent numerous updates through 21 December 2004. The Circular is addressed to all Federal Chief Financial Officers, Chief Information Officers, and Program Managers. The most current circular update (2004) was signed by then-Controller Linda M. Combs. The 2004 update to Circular A-123 is a re-examination of the existing internal control requirements for Federal agencies and was initiated in