This document outlines Leland Bartlett's proof that the area of a circle can be calculated by summing the areas of many triangles circumscribing the circle. It begins with area formulas and trigonometry lessons. Then, it shows the calculations for 4, 8, 16, 32, 1024, and 32768 triangles approximating a circle with diameter 6 and radius 3. The sums converge on the expected area and circumference values with very small differences. In the end, it is shown that the height of the triangles approximates the radius, proving the area formula. Leland Bartlett provides training in various topics like Microsoft Office and databases as a professional consultant and trainer.