Circular segment Circular segment In geometry, a circular segment (symbol: ⌓) is a region of a circle which is "cut off" from the rest of the circle by a secant or a chord. More formally, a circular segment is a region of two-dimensional space that is bounded by an arc (of less than 180°) of a circle and by the chord connecting the endpoints of the arc. Let "R" be the radius of the circle, "θ" the central angle in radians, α is the central angle in degrees, "c" the chord length, "s" the arc length, "h" the sagitta (height) of the
OMB Circular A-21 OMB Circular A-21 OMB Circular A-21 is a Government circular that sets forth the rules governing the eligibility and calculation of costs in support of sponsored research, development, training and other works produced in agreement with the United States Federal Government, but does not attempt to identify or dictate agency or institutional participation in those works. The last revision is dated May 10, 2004. This circular is divided into ten sections: This section outlines the principles and policies that must be followed regarding the accounting principles, arrangements, and exemptions for any training or work produced under the contract as agreed