a sector has been cut out from a circular piece of cardboard of radius 21 cm What is the perimeter of the remaining piece cardbord ..the angle between the two radius is 60
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thita/360×pi r square
60/360×22/7×21×21
11×3×21
33×21
693
60/360×22/7×21×21
11×3×21
33×21
693
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