Quadrilaterals & Polygons
Polygons belong to nested families defined by properties, and their angle structure can often be understood by decomposing them into triangles.
What you'll learn
- Classify quadrilaterals using stated side, angle, and parallel-line properties.
- Recognize nested categories such as square, rectangle, and rhombus.
- Derive an n-gon's interior-angle sum from n−2 triangles.
- Define regular polygons through equal sides and equal angles.
- Use a consistent exterior turn and account for internal shared edges.
Before you start
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