Trigonometry close trigonometryThe study of sides and angles in triangles. can be used to find a missing angle in a right-angled triangle when two sides are known. An understanding of the three ...

Trigonometry is based on the specific relationships between the sides and angles of right triangles. Using trigonometry, a person can determine the missing angle and side measurements of a right ...

Understanding the concept At its core, the Pythagorean theorem provides a reliable method for finding unknown sides in right-angled triangles.

2. Using Sketchpad, create a variety of shapes (examples and non-examples of triangles). Begin with open and closed shapes, and shapes with or without straight sides.

An angle can be calculated using an equation that relates the corners of a triangle (using the concepts of sine, cosine or tangent) to the length (distance) of the side opposite it.

A 3,700-year old Babylonian clay tablet reveals an ancient method of constructing right-angled triangles that makes it the world’s oldest and most accurate trigonometric table.

A Lower Bound on the Angles of Triangles Constructed by Bisecting the Longest Side Ivo G. Rosenberg and Frank Stenger Mathematics of Computation , pp. 390-395 (6 pages) ...

Learn how to find the angles in right-angled triangles with this BBC Bitesize Maths article. For students between the ages of 11 and 14.