How to Solve the Bigger Quadrilateral Puzzle

The “paradox” might make it difficult for you to solve the larger quadrilateral puzzle. The puzzle consists of four congruent quadrilaterals, and a small square. However, the total area seems to be the exact same. The apparent paradox is a result of the fact that one side of the new, larger square is smaller than the original one. The solution is a matter of finding the angle between two opposing sides of each quadrilateral. This angle is known as the “sec2th” angle.