# Geometry

Congruent Triangles

- Angle Sum Theorem
- Circle Area Approximation
- Circumcircle and Circumcenter
- Congruent Triangles
- Cross to Isosceles Triangle Dissection
- Inscribed Angle Theorem
- Octagon to Two Smaller Octagons Dissection
- Polygon Names
- Quadrilateral Angle Sum
- A Visual Proof of the Pythagorean Theorem
- Deriving the Area of Trapezoid
- Deriving the Area of Parallelogram
- Pythagorean Theorem Proof 1
- Pythagorean Theorem Proof 2
- Pythagorean Theorem Visual Proof
- The SSS Triangle Congruence
- The Midline Theorem
- Napoleonâ€™s Theorem
- Exploring Triangles