Spherical geometry other geometric concepts are defined as in plane geometry, but with straight lines replaced by great circles. Thus, in spherical geometry, angles are defined between great circles, resulting in a spherical trigonometry that differs from ordinary trigonometry in many respects; for example, the sum of the interior angles of a triangle exceeds 180 degrees. Spherical geometry is "not" elliptic geometry, but is rather a "subset" of elliptic geometry. For example, it shares with that geometry the property that a line has no parallels through a given point. Contrast this with Euclidean geometry, in which a line has one parallel through
OMB Circular A-21 contract. This section covers permissible and nonpermissible costs involved in a project. To simplify, the following costs are allowed (within the circular guidelines): Anything outside the scope of these costs is typically not allowed unless it falls under one of the specifically mentioned exceptions within the circular. This is a short form that requires the named institution, signature, name of official, title, and date, that when collected certifies that all costs have been accounted for and are within the cost guidelines, under penalty of perjury. OMB Circular A-21 OMB Circular A-21 is a Government circular that sets forth the rules