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If area of quadrant of a circled is 38.5...

If area of quadrant of a circled is `38.5 cm^(2)` then find its diameter (use `pi= (22)/(7)`)

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Area of quadrant `= (1)/(4) xx (22)/(7) xx r^(2) = 38.5 `( use `pi= (22)/(7)` )
`rArr r = 7` cm
`therefore ` diameter `= 14` cm
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