Circumference
The circumference of any particle(circle , square etc) is perimeter of the particle.
Example-
let you walk on a park and park is square shape then one round of square shape is called perimeter.
why perimeter and cicumference is called equal ?
perimeter and cicumference have only one work "measurment of all closed surface".so it is called equal.
some formula
perimeter of square is 4 x side of a square.
perimeter of rectangle is 2(length + width).
perimeter of triangle sum of three side of a triangle.
