# Lessons on Graphs (Free Mathematics Lessons and Tests)

# Graphs

- The parts of a graph
- The origin explained
- The y-axis explained
- The x-axis explained
- Bar charts and line graphs ( interactive widget)
- Pie chart ( interactive widget)
- What are Cartesian coordinates?
- The y-coordinate explained
- The x-coordinate explained
- What are polar coordinates?
- Polar and Cartesian co-ordinates ( interactive widget)