The sum of lengths of all sides of a closed plane figure is called \( \begin{array}{llll}\text { (a) area } & \text { (b) perimeter } & \text { (c) volume } & \text { (d) length }\end{array} \) A string 16 cm long is used to form a square. The length of side the square is \( \begin{array}{llll}\text { (a) } 4 \mathrm{~cm} & \text { (b) } 6 \mathrm{~cm} & \text { (c) } 3 \mathrm{~cm} & \text { (d) } 48 \mathrm{~cm}\end{array} \)

The term "perimeter" comes from the Greek word "perimetron," meaning "measure around." It's the total distance around a geometric figure, whether it be a square, triangle, or any other shape. This concept is fundamental in geometry and is used in various fields, including architecture and engineering, to determine the materials needed for construction. To find the length of one side of a square with a total perimeter of 16 cm, you simply divide the perimeter by the number of sides (which is 4). This means each side measures 4 cm. Squares are fascinating because all sides are equal, making them great shapes for creating balance in design and structure!