the area of a circle is 154 cm . its diagonal is
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area of circle is π r square
π r square = 154
22\7 × r square= 154
22 ×r square = 154×7
22× r square = 1078
r square = 1078\22
r square= 49
r= 7
now we know diagonal of circle = diameter of circle so diameter = 7+7=14
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