Special right triangle triangles are used to aid in calculating common trigonometric functions, as below: The 45°–45°–90° triangle, the 30°–60°–90° triangle, and the equilateral/equiangular (60°–60°–60°) triangle are the three Möbius triangles in the plane, meaning that they tessellate the plane via reflections in their sides; see Triangle group. In plane geometry, constructing the diagonal of a square results in a triangle whose three angles are in the ratio 1 : 1 : 2, adding up to 180° or radians. Hence, the angles respectively measure 45° (), 45° (), and 90° (). The sides in this triangle are in the ratio 1 : 1
The Three Degrees (album) "Dirty Ol' Man", a #1 hit single in the Netherlands, "Year Of Decision" and the UK #1, "When Will I See You Again". The album charted at #11 on the UK album chart. The album was re-issued on CD in 2010, for the first time in the UK, by Big Break Records. This re-issue includes three bonus tracks including a 1977 remix of "Dirty Ol' Man" by Tom Moulton. with: The Three Degrees (album) The Three Degrees is a 1973 studio album released by girl group The Three Degrees. Since their formation in 1963 until 1969, The Three Degrees had