This chapter serves as an educational guide on measuring space, specifically focusing on the fundamental geometric concepts of perimeter and area. It begins by using a practical scenario of a staggered start in a relay race to pique interest in why curved paths require different lengths, which leads into a deep exploration of the perimeter of a circle and its constant C/D ratio. The source provides a rich historical overview of how mathematicians across cultures—from Mesopotamia and China to India’s Mādhava of Sangamagrāma—discovered and refined the value of pi ($\pi$), eventually identifying it as an irrational number. Beyond theory, the text provides functional formulas for arc length and the area of various polygons, inviting students to apply these principles through visual puzzles and real-world problems involving track dimensions and overlapping shapes.