A plastic rope of length 12 m is taken to fence around rectangular roof. Of the given plastic rope, only 11 m is used. Find the length of rope that remains unused.
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The cross-sectional area of a wire can be expressed in terms of square units (square inches or square mils), circular mils, or “gauge” scale. Calculating square-unit wire area for a circular wire involves the circle area formula: A = πr2 (square units)
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