The trigonometric ratios for the angles 30°, 45° and 60° can be calculated using two special triangles. An equilateral triangle with side lengths of 2 cm can be used to find exact values for ...

The trigonometric ratios for the angles 30°, 45° and 60° can be calculated using two special triangles. An equilateral triangle with side lengths of 2 cm can be used to calculate accurate ...

Most trigonometry students look at triangles on a flat surface. However, people from ancient astronomers to modern navigators calculated the arc lengths and angles of triangles on a sphere. They used ...