Perimeter of Polygons
The perimeter of a polygon is the total length of all its sides.
Practice This ConceptMain explanation
Teacher explanation
For any closed figure made of straight sides, walk once around the boundary and add every side length. For regular polygons, all sides are equal, so multiplication saves time.
Example
A rectangle of length 12 cm and breadth 7 cm has perimeter 2(12 + 7) = 38 cm.
Simple analogy
Perimeter means the path around the figure.
Common confusion
Students sometimes add only two sides of a rectangle, forgetting that opposite sides are also part of the boundary.
Exam tip
Always check whether the question asks for boundary length or surface area before choosing a formula.
Answer writing and exam use
1-mark use
Write the exact meaning of perimeter of polygons in one clean line.
2-mark use
Define perimeter of polygons and add one example or condition.
3-mark use
Explain perimeter of polygons, show the method or example, and mention the common mistake.
Practice this concept with focused MCQs
Open the concept quiz intro first, review the test details, and then start a focused MCQ set from this concept only. Instant score and answer review are live now.
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