Interactive Geometry Concepts

**Parallel Lines** are two distinct lines that have the **same slope** ($m_1=m_2$) and never intersect.

A **Regular Polygon** is both **equilateral** (all sides equal) and **equiangular** (all angles equal). Drag the green vertices to create and analyze the shape.

An **Ellipse** is the locus of all points where the **sum of the distances** from two fixed points (the **Foci**, $F_1$ and $F_2$) is constant.