Measurements

- The perimeter of a closed figure is the distance covered along the boundary of the figure when we go around it once. Its units are cm, m etc.

Example: Let us find the perimeter of the following figure.

Perimeter of ABCDEFGHIJA = AB + BC + CD + DE + EF + FG + GH + HI + IJ + JA

= (5 + 6 + 6 + 5 + 7 + 9 + 7 + 4 + 4 + 25) cm

= 78 cm

Perimeter of an equilateral triangle = 3 × length of a side

Perimeter of a square = 4 × length of a side

In general, perimeter of a regular closed polygon = Number of sides of the polygon × length of each side

**Example:**

**If a farmer wants to fence a square field of length 50 m with 5 rounds of wire then what is the len…**

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