We are currently developing the online version of our math curriculum. Here is a sample lesson:

# Finding the area of a circle

A circle is a collection of points a certain distance (its radius) from another point, its center. The area of the circle is all of the space inside of it.

**To find the area:**

- Take the radius
**(r)**of a circle (the distance from the circle’s center to any point on the circle itself) - Square it
- Multiply by
**π**(the Greek letter pi, pronounced “pie,” is an irrational number that’s a bit more than 3: round pi to 3.14 or 22/7) - That gives you the circle’s
**area**(all of the blue space inside of it).

**The formula for these steps: π r ^{2} = A**

- r is the radius of the circle
- A is the area of the circle

Note that squaring a length (like a radius) turns one-dimensional space (something you can measure with a ruler, like a radius) into two dimensional space (the area of the circle).