The term Menstruations coming from geometry, that concerned with measuring of lengths, areas and volumes etc of area.
It learn us to calculate the lengths, area, volumes and also comparing that.
Perimeter is the covered distance along with the boundary forming a that closed with such area of figure.
Perimeter of a rectangle
Perimeter of the rectangle = Sum of the lengths of its four sides.
Or
Perimeter of a rectangle = 2 x (length + breadth)
Perimeter of regular shapes
Perimeter of square = 1m + 1 m + 1 m + 1 m = 4 m
Perimeter of a square = 4 x length of a side
Perimeter of an equilateral triangle = 3 x length of a side
Area of a rectangle = (length x breadth)
Area of the square = side x side