what is boundary area
Boundary is a border that encloses a space or an area. The distance around the boundary is called as 'perimeter'. The length of the three sides of a triangular field is 9 m, 5 m, and 11 m. The boundary or perimeter of the field is given as 9 m + 5 m + 11 m = 25 m.
Definition of boundary for English Language Learners. : something (such as a river, a fence, or an imaginary line) that shows where an area ends and another area begins. : a point or limit that indicates where two things become different. boundaries : unofficial rules about what should not be done : limits that define acceptable behavior.