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Given that, The radius of the base(r) of the cone is 7 cm and its volume is of the hemisphere.

circular base of cone is joined with the plane surface of the hemisphere,

radius of hemisphere = radius of base of cone = 7 cm

Also,vol. of cone = vol. of hemisphere h = 3r

h = 3 × 7

h = 21 cm

Also, slant height(l) = √ r2 + h2

l = √ 72 + 212

l = √ 490

l = 22.13

Slant Height of cone (l) = 22.13 cm

Now, surface area of toy = surface area of cone + surface area of hemisphere

surface area of toy = πrl + 2πr2

= πr(l + 2r)  = 794.86 cm2

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