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Q.

Tahir measured the distance around a square field as 200 rods (lathi). Later he found that the length of this rod was 140cm. Then the side of this field in meters is ____.


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Detailed Solution

Tahir measured the distance around a square field as 200 rods (lathi). Later he found that the length of this rod was 140cm. Then the side of this field in meters is 70 m.
Given that,
Distance around a square field is 200 rods and length of the rod is 140 cm.
We have to find side of the field in meters.
We will use the formula,
Total distance around a square field = Perimeter of a square field.
⇒200 = 4 × side ⇒side = 2004  ⇒side = 50 rods ∴ 1 rod = 140 cm  ∴ 50 rods = 50 × 140 = 7000 cm As we want the length in meters,
1 m = 100 cm ⇒1 m = 1100 cm  ∴ 7000100 = 70 m Hence, the side of the field is 70m.
 
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