Answers

2014-01-06T17:32:38+05:30
Take the formula area=pi * r^2
then the area will be 7cm
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2014-01-10T20:21:21+05:30
Surfacearea of a sperre is= 4pie r^2
therefore                    154=4* 22/7*r^2
                     154*7/4*22 =r^2
                          12.25 =r^2
                            r=3.5cm
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