Perimeter of a Polygon

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  • (0:01) Perimeter of a Polygon: Means the total length around a polygon. Add up the lengths of all sides to find the perimeter.
  • (0:12) Perimeter Formulas: To find the perimeter of rectangles, use $2 \times (\text{length} + \text{width})$. To find the perimeter of squares, the perimeter is $4 \times \text{side length}$.
  • (0:55) How to Find Perimeter of Triangles: For a general triangle, add all three sides. For isosceles triangles, use $2a + b$; for equilateral triangles, use $3a$.
  • (1:48) How to Find Perimeter of Compound Shapes: For L-shaped polygons, rearranging edges into a rectangle can make perimeter calculations easier.

📂 Revision Cards

Perimeter of a rectangle and square with formulas. Rectangle: length 5 cm, width 3 cm, perimeter 16 cm. Square: side 2 m, perimeter 8 m.
1) Perimeter of Polygons, Quadrilaterals, Squares
Comparing the perimeter of an isosceles triangle and an equilateral triangle, showing the formulas and values for calculating their perimeters.
2) Perimeter of Triangles
Perimeter of an L-shaped polygon shown with two calculation methods. Method 1 adds all side lengths. Method 2 treats it as a rectangle.
3) Perimeter of Complex Shapes

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Perimeter of a Polygon

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Q: What is the perimeter of a square with side length 6 cm?

A blue square with a side length of 6 cm labelled.

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Q: Find the perimeter of a rectangle with length 8 cm and width 5 cm.

A yellow rectangle with side lengths labelled as 8 cm and 5 cm.

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Q: The perimeter of an equilateral triangle is 36 cm. What is the length of one side?

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Q: An isosceles triangle has a base of 12 cm and two equal sides of 10 cm each. What is its perimeter?

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Q: An irregular hexagon has edges of the following lengths: 7 cm, 12 cm, 10 cm, 8 cm, 11 cm, and 9 cm. What is its perimeter?

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Q: A square has a perimeter of 100 cm. If its side length is increased by 5 cm, what will be the new perimeter?

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