The radius of base of a right circular cone is 4 cm. Its height is 1 cm less than the radius of base. Find the curved surface of the cone(in square cm).(Use π = 3.14)

The radius of base of a right circular cone is 4 cm. Its height is 1 cm less than the radius of base. Find the curved surface of the cone(in square cm).(Use π = 3.14)
1). 60.2
2). 62.8
3). 63.9
4). 66

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