Question
There is a rectangular tank of length 180 m and breadth 120 m in a circular field . If the area of the land portion of the field is 40000 `m^2` , what is the radius of he field ?
Answer: Option C
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Total area of the field = [(180 x 120) + 40000] `m^2`
= (21600 + 40000) `m^2` = 61600 `m^2`
`:.` `pi R^2 = 61600`
`hArr r^2 = (61600 xx 7/22)` = 400 x 7 x 7) m
`hArr R = 20 x 7 = 140 m.
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