# Big ideas start with the basics.

A picture, an explanation, a little exploration. Start wherever you are with small visual lessons and ideas you can build on everywhere.

Begin with Zon’s sine lesson, then bring that understanding into a football launch-angle challenge. Watch the stories, make predictions, explore the interactives, and check your understanding with hints.

The collection also includes sample video walkthroughs of a Cassini oval and the mathematics of motion.

Canonical page: https://21ifm.com/basics

## Explore

- [Sine is a height. Let’s see why.](https://21ifm.com/basics/sine)
- [Help Zon choose a launch angle](https://21ifm.com/basics/best-launch-angle)
- [Meet Zon](https://21ifm.com/about)