**All Time Top Posts**

- Deriving the Formula of the Arithmetic Sequence

- Representing the Sum and Difference of Two Squares
- The Sum of the First n Positive Integers
- The Proof of the Midsegment Theorem
- An Intuitive Proof to The Infinitude of Primes
- Linking Triangle Angle Sum and Inscribed Angle Theorems
- Deriving the Sum of the Arithmetic Sequence
- The Proof of the Isosceles Triangle Theorem
- Making Connection Between Areas of Trapezoids and Parallelograms
- The Triangle Angle Sum Theorem

**Top Posts April 2013**

- The Proof of the Isosceles Triangle Theorem

- Proving the Perpendicular Bisector Theorem Using SAS Congruence
- Proof that Equilateral Triangles are Equiangular
- The Closure Property of Positive Real Numbers Under Addition
- Arithmetic Mean Proof
- Proof by Contradiction: 0.999… = 1

Updated: May 16, 2013