a) 84 meters
b) 90 meters
c) 168 meters
d) 336 meters
Answer: a
Explanation:
$$\eqalign{
& {\text{Let}}\,{\text{the}}\,{\text{length}}\,{\text{of}}\,{\text{the}}\,{\text{wire}}\,{\text{be h}} \cr
& {\text{Radius}} = \frac{1}{2}mm = \frac{1}{{20}}cm.\,{\text{Then}}, \cr
& \frac{{22}}{7} \times \frac{1}{{20}} \times \frac{1}{{20}} \times h = 66 \cr
& h = {\frac{{66 \times 20 \times 20 \times 7}}{{22}}} \cr
& \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 8400\,cm \cr
& \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, = 84\,meters \cr} $$
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