ELI5: grade seven trigonometry

What is trigonometry?

Trigonometry is a branch of math that helps you find missing measurements in triangles by using the relationships between angles and sides [1][2]. It's like having a special tool that lets you figure out how tall a tree is without climbing it or measuring it directly.

Why do we use it?

When you have a triangle and you know some information (like one angle and one side), trigonometry gives you special ratios that help you find the other missing pieces [2]. Think of it like a detective game where you use clues you have to discover the clues you don't have.

What are the basic trigonometric ratios?

There are six main trigonometric ratios, but the most important ones are called sine, cosine, and tangent [2]. These ratios compare different sides of a right triangle to each other, kind of like saying "if this side is this long, then that side should be this long."

How do you use it?

You identify what you know about your triangle, pick the right ratio, and then use it to solve for what you don't know [1]. It's like following a recipe—you just plug in your numbers and follow the steps to get your answer.