1. Use the formula of equilateral model to calculate the area of triangle. For example, if we know the length and height of the base of a triangle, we can use the formula of equilateral model to calculate the area of the triangle. Specifically, we can multiply the length of the base by the height and then divide it by 2 to get the area of the triangle.
2. Calculate the area of trapezoid by using the formula of equilateral model. For example, if we know the upper bottom, lower bottom and height of a trapezoid, we can use the formula of equilateral model to calculate the area of this trapezoid. Specifically, we can multiply the upper bottom and the lower bottom by the height, and then divide by 2 to get the trapezoidal area.
3. Calculate the area of polygon with the formula of equilateral model. For example, if we know the sum of the inner and outer angles of a polygon and the number of sides, we can calculate the area of the polygon by using the formula of the model of equal sides. Specifically, we can multiply the sum of internal angles by the number of sides, and then divide by 2 to get the area of the polygon.
4. Calculate the surface area of three-dimensional graphics by using the formula of equilateral model. For example, if we know the side length of a cube, we can use the formula of equilateral model to calculate the surface area of the cube. Specifically, we can add up the areas of six squares to get the surface area of a cube.