Perimeter of a closed plane figure is the length of its boundary. Area of a closed plane figure is the measure of the region (surface) enclosed by its boundary. In a right angled triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides. Area is a property of all two-dimensional figures. It measures the combined length and width of a region. In the following lessons we'll explore the area of regions in a plane, although area is also a property of two-dimensional surfaces that don't lie in a plane. In those cases, covered in Three Dimensional Measurements, it is referred to as surface area. A region in a plane is defined as any simple closed curve united with its interior. Such a curve can be convex or concave; either way, it has area. The unit of measurement of area is the square unit, which, specifically, is a square whose sides are one unit long. Square units is a generic term; it can be measured according to different measures of length. For example, a piece of paper is measured in square inches, whereas land is measured in square miles. Chapter 32 covers important concepts such as finding the perimeter and area of figures like rectangle, square and triangle. The important formulas and the method of solving problems are given in a descriptive manner, for a better conceptual knowledge among students.