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.
An acute angle is any angle smaller than a right angle. A right angle is an angle that measures 90 degrees. A right angle forms part of a square, which is why it's often depicted by a square at the angle: So an acute angle is always smaller than the shown angle.