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Three-level perimeter area formula
The formula of perimeter area in Grade Three is "perimeter = length × width", as follows:

First, introduce the perimeter:

1. Perimeter refers to the sum of the lengths of the boundary line segments of a closed graph. In geometry, perimeter is defined as the boundary length of two-dimensional geometry. Common geometric figures such as squares, rectangles, circles, triangles, etc. Has its own perimeter calculation formula.

2. In physics, perimeter is often used to calculate physical quantities such as impedance, inductance and capacitance. For example, in a circuit, the circumference can be used to calculate the induced electromotive force of the inductor coil and the charge and capacitance of the capacitor.

3. In computer science, perimeter is generally used for image processing. For example, in mathematical morphology, perimeter can be used to calculate the size, shape, motion and other characteristics of image objects.

4. Perimeter is an important mathematical and physical concept, which is widely used in architectural design, engineering drawing, computer science, mathematical morphology and many other fields. A correct understanding of the perimeter can help people better understand the world and master the laws of physics.

Second, the perimeter application:

1. In architectural design, perimeter is a very important value, which can be used to calculate the perimeter of a room and the length of a wall. For architects, a correct understanding of perimeter can help them to better carry out architectural design. For example, when designing a house, the architect needs to calculate the perimeter and area of the room to determine the size and layout of the house.

2. Perimeter is also an important concept in artistic creation. In works of art, perimeter can be used to describe the size and shape of artistic forms created by artists. For example, painters can use perimeters to measure the size of picture frames and canvases.

3. Mathematical morphology is a branch of mathematics, which is mainly used to describe and analyze various shapes. In mathematical morphology, perimeter is used to calculate the size, shape, motion and other characteristics of image objects. Perimeter can also be used to measure the curvature and smoothness of an object. For example, in medical image processing, perimeter can be used to calculate size and shape.