Question

please give my answer​

Answer 1

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$Radius \: of \: a \: cone \: is  \: 3.5cm, \\ Height \: of \: a \: cone \: is \:  15.5−3.5=12cm \\ Slant \: height \: of \: cone \: is, \\l=√ {h}^{2} + {r}^{2} \\  =√ {12}^{2} + {3.5}^{2} \\=√144+12.25 \\ =√156.25 \\ =12.5 \: cm. \\Curved \: surface \: area \: of \: cone \: is \\ =2πl \\ = \frac{22}{7} ×3.5×12.5\\ =137.5c {m}^{2} \\ Curved \: surface \: area \\ of \: hemispherical \: portion \: is \: , \\=2π {r}^{2} \\ =2× \frac{22}{7} ×3.5×3.5 \\ =77c {m}^{2} \\ Hence, \: total \: surface \: area, \\ 137.5+77=214.5c {m}^{2}$

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Answer 2

Step-by-step explanation:

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