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

However, it's still hard to get an intuitive sense of the relationship between the circle and the trigonometric functions and the triangles. That all changes with animated GIFs.

Trigonometry is a branch of mathematics that studies relationships between the sides and angles of triangles. Trigonometry is found all throughout geometry, as every straight-sided shape may be ...

Use as an introduction or recap to lessons on trigonometry. Discuss with students that the different trig functions are based on ratios and show this by comparing similar triangles.

In the mid-twentieth century, American tool manufacturers sometimes distributed trigonometry tables that included advertisements for their products. This small paper pamphlet includes definitions of ...

By using the Law of Sines, and avoiding the Pythagorean theorem’s trig identity (sin²α + cos²α = 1), Johnson and Jackson successfully proved the theorem without resorting to circular ...

In high school, you probably learned that trigonometric functions – like sine, cosine and tangent –can be derived, geometrically, from a circle (hence why ...

At an American Mathematical Society meeting, high school students presented a proof of the Pythagorean theorem that used trigonometry—an approach that some once considered impossible ...