It’s the end of the year again, so let’s look at what we have learned so far in 2015. Below is the complete list of posts of mathematical proofs this year. Enjoy learning!

**Year 2015 in Review – Complete List of Posts**

- Absolute Value Proofs: Products and Quotients
- Proof of the Converse of the Pythagorean Theorem
- Proof that The Diagonals of a Rhombus are Perpendicular
- A Proof of The Trapezoid Angle Theorem
- The Proof of the Kite Symmetry Theorem
- Sample Proof on Triangle Congruence Part 2
- Sample Proof on Triangle Congruence Part 1
- Slope of Perpendicular Lines Theorem
- The Sum and Product of Roots Theorem
- Sample Proof on Triangle Congruence Part 3
- Proof that the nth root of a times nth root of b is equal to nth root of ab
- Difference of 3-Digit Numbers with Reversed Digits
- The Sum of Two 2-Digit Numbers with Reversed Digits
- The Sum of Two Consecutive Odd Numbers
- Proof that There Are Only Three Regular Tessellations

You may also want to visit the** Post List Page** to explore the complete list of posts of Proofs from the Book.