A toy is in the form of a hemisphere surmounted by a right circular cone of the same base radius as that of the hemisphere. If the radius of the base of the cone is 21cm and its volume is 2/3 of the volume of the hemisphere, calculate the surface area of the toy. (pie=22/7)
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Dear Ayushasuktar,
you made a small mistake in the final calculation
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
as you can see 2 x 21=42 not 41
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