BOUNDARY
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Definition of Boundary
Boundary is a border that encloses a space or an area.
More About Boundary

The distance around the boundary is called as 'perimeter'.
Video Examples: What Is a Boundary Line in Graphing?
Example of Bisector of a Line
 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
Solved Example on Boundary
Ques: A gardener wants to plant 4 plants per meter along the boundary of a garden, which is represented by the quadrilateral ABCD shown in the figure. Calculate the number of plants required.
Choices:
A. 75B. 80
C. 70
D. 60
Correct Answer: B
Solution:

Step 1: Perimeter of the quadrilateral ABCD = Sum of the four sides of the quadrilateral.
Step 2: = AB + BC + CD + DA
Step 3: = 3 + 8 + 4 + 5 = 20 meters [Substitute AB = 3, BC = 8, CD = 4, and DA = 5 and simplify.]
Step 4: The number of plants required = 20 × 4 = 80.
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