A piece of wire is used to make circles of the following pattern. The radius of the first circle is 'r' cm and it is increased by 1 cm successively. Find the length of the wire that is required to make 5 such circles.
A) (10\pi +r)cm B) 2\pi \,cm C) 10\pi (r+2)\,cm D) 2\pi (r+2)\,cm
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your answer is c current situation
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the correct answer is 10pie(r+2) cm
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