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Question
From a circular piece of cardboard of radius 3 cm two sectors of 900 have been cutoff . Find the perimeter of the remaining portion nearest hundredth centimeters ( `"Take" pi = 22/ 7`).
Solution
Since the sectors are of central angle 90° o, the sector is in the form of a quadrant Two such quadrants are cut off. So, a semicircle is left.
Perimeter of the semicircle =` pi r`
`= 22/7xx(3)`
`=9.428 cm`
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