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Formula mathematics that must be memorized at the beginning of a small promotion.
Formula and its application;

1, rectangle perimeter = (length+width) ×2 rectangle length = perimeter ÷2— wide rectangle width = perimeter ÷2— long rectangle area = length × width = area ÷ width = area perimeter ÷ long square = side length ×4.

Side length = perimeter ÷4 square area = side length × side length

2. The perimeter of a triangle = the sum of three sides; Area of triangle = base × height ÷ 2; Height of triangle = area ÷ base ×2. The base of triangle = area/height ×2.