Learn how to find the perimeter of regular and irregular shapes using formulas and examples. Explore real-world applications of perimeter and practice problems with interactive games. Perimeter : Learn the Definition and Different Methods to find the Perimeter followed by Formulas for Different Shapes, Comparisons, Uses & Solved Examples Perimeter Calculator Use this perimeter calculator to easily calculate the perimeter of common bodies like a square, rectangle, triangle, circle, parallelogram, trapezoid, ellipse, regular octagon, and sector of a circle. Formulas and explanation below. Find the perimeter of 12 popular shapes with this intuitive perimeter calculator - quick, accurate, and user-friendly!