Trigonometry class 10

Why triangles are the secret code of the universe

Look at a simple shadow cast by the afternoon sun. You're actually looking at the universe's fundamental building block: the right triangle.

Here is the secret. If you lock this one angle, the triangle can grow to the size of a galaxy, or shrink to an atom. Its true identity never changes.

Because the shape is locked, the ratio between any two of its sides is always exactly the same. We gave these fixed ratios fancy names—sine, cosine, and tangent—but they're really just the triangle's DNA.