a toy is in the form of a hemisphere surrounded by a right circular cone of the same base radius as that of the hemisphere if the radius of base of the cone is 21 cm and its volume is 2 by 3 of the volume of the hemisphere calculate the height of the cone and the surface area of the toy
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Surface area of toy = surface area of cone + surface area of hemisphere
= πrl + 2πr²
= πr ( l+2r)
= 22/7 × 21 (35 + 2 × 21)
= 22 × 3 ( 35 + 42)
= 66 ( 77 )
= 5082 cm²
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