All you need to know about Isosceles Triangles

- Reference:
- List of polygons
- Euler's Formula

- The Circle (Simple Wiki).
- Measurement of a Circle: a treatise of three propositions by Archimedes.
- Equation of a Circle
- More on Equation of a Circle
- Even more on Equation of a Circle
- Circle Theorems
- Inscribed Angle Theorem
- Intersecting Chords Theorem
- If $({x}_{1},{y}_{1})$ and $({x}_{2},{y}_{2})$ are the co-ordinates of the end of the diameter of a circle, then $(x-{x}_{1})(x-{x}_{2})+(y-{y}_{1})(y-{y}_{2})=0$