Angle: The measure of the opening between two intersecting lines is called an angle. Unit: The unit of angle is radians or degrees. Angle formula: There are different types of formulas for ...

I'm talking about trigonometry, of course: that bastion of angles and triangles that is essential to calculating velocity, momentum, and much more.

Discover the different types of angles and how to make sure you get the biggest slice of pizza. Measuring angles . Find out how to measure angles up to 180 degrees using a protractor.

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.

Trigonometry analyzes the relationships between the sides and angles of triangles; it is intrinsic to geometry and plays an important role in other branches of mathematics.

Trigonometry allows one to systematically convert between measurements of angles and measurements of length, a topic that has interested mathematical astronomers from antiquity. Ancient Greeks also ...