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so what will be the radius radius will be equals to 13 plus 15 which is equals to 28 28 is given in the option a so a is the correct answer is equals to 7 plus yeah has a two pi linear two pi r or you have two pi common linear theoretical thirteen plus fifteen that means two pi two pi cancel r will be equals to thirteen plus fifteen which will be goes to twenty simple r equals to hindu which is equals to twenty eight it is given in the option a so is the current answer