1 The total surface area of a cone with radius \( x \) and slant height 3\( x \) is equal to the area of a circle with radius r Show that \( r = 2 x \) . [The curved surface area, \( A , \) of a cone with radius \( r \) and slant height \( l \) is \( A = \pi r k ] \) \( A n \operatorname { siver } ( b ) \)

Question

1 The total surface area of a cone with radius \( x \) and slant height 3\( x \) is equal to the area of a circle with radius r Show that \( r = 2 x \) . [The curved surface area, \( A , \) of a cone with radius \( r \) and slant height \( l \) is \( A = \pi r k ] \) \( A n \operatorname { siver } ( b ) \)

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