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Question
Tahir measured the distance around a square field as 200 rods (lathi). Later he found that the length of this rod was 140 cm. Find the side of this field in metres.
Solution
Given, total distance around a square field = 200 rods
And 1 rod = 140 cm
Total distance around a square field = Perimeter of square field
⇒ 200 = 4 × Side
⇒ `200/4 = (4 xx "Side")/4` .....[Dividing both sides by 4]
⇒ Side = 50 rods
∵ 1 rod = 140 cm
∴ 50 rods = 50 × 40 = 7000 cm
= `7000/100` m .....[∵ 1 m = 100 cm]
= 70 m
Hence, the side of the field is 70 m.
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