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 length of the wire required?
Solution:
Length of wire required = 5 × (perimeter of square field)
= 5 × (4 × side)
= 5 × [(4 × 50) m]
= 1000 m
- Perimeter of a rectangle = 2 (length + breadth)
Example:
What is the perimeter of a rectangular field whose length and breadth are 15 m and 8 m respectively?
Solution:
Perimeter of rectangular field = 2 (15 m + 8 m) =…
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