This project is designed to show the reason or formula to find the area of a equilateral polygon in circle's knowledge of basic mathematical relationships of geometric picture story. Trigonometric ratios and the GSP program application Used to calculate the polygon area. The purpose of the project to create a formula to find the area where most of the equilateral polygon corners as attachment in your circle and check the results of the calculations by which the GSP GSP programs as tools to learn to enjoy math. Easy to understand, and the concrete is considered to encourage prospective international students with creativity and imagination. The results of this study found that:
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