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A sector of radius 4.2 cm has an area 9.24 cm2. Find its perimeter. |
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Answer» Radius of the sector r = 4.2 cm Area of the sector = 9.24 cm2 lr/2 = 9.24 (l×4.2)/2 = 9.24 l × 2.1 = 9.24 l = 9.24/2.1 l = 4.4 cm Perimeter of the sector = 1 + 2r units = 4.4 + 2(4.2) cm = 4.4 + 8.4 cm = 12. 8 cm Perimeter of the sector = 12.8 cm |
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