SSARS 21 is effective for engagements performed for periods ending on or after. December 15, 2015. Early implementation is allowed. So, basically practitioners. must implement it for calendar year end 2015 (December 31, 2015) engagements, but may choose to implement it earlier.
acute triangle, acute-angled triangle-a triangle whose interior angles are all acute. equiangular triangle, equilateral triangle-a three-sided regular polygon. isosceles triangle-a triangle with two equal sides. oblique triangle-a triangle that contains no right angle.
In any triangle, two of the interior angles are always acute (less than 90 degrees)*, so there are three possibilities for the third angle: 1  Less than 90Â° - all three angles are acute and so the triangle is acute. 2  Exactly 90Â° - it is a right triangle. 3  Greater than 90Â° (obtuse): the triangle is an obtuse triangle.