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Answers
円錐の底面の円周は
5 × 2 × π = 10π
円錐が4回転したので、点線の円の円周は
10π × 4 = 40π
円錐の母線の長さをaとすると、aは点線の円の半径に等しいので
2 × a × π = 40π
これを解いて
a = 20(cm)
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