(B)..(1).... give the answer....
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vikinayak:
formula leke krna
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2πr*thetha/360
2*3.14*18*80/360
2*3.14*18*8/36
3.14*18*8/18
3.14*18*4/9
3.14*6*4/3
3 .14*2*4
3.14*8
25.12cm
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