Question

Please solve this problem​

Answer 1

Answer:

Step-by-step explanation:

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

MARK IT THE BRINALEIST

Answer 2

Step-by-step explanation:

Given volume is 2/3 so

$\: \: \: \: \: \: \: \: \frac{2}{3} \pi {r}^{3} \times \frac{2}{3} = \pi {r}^{2} h \\ \implies \: h = \frac{4}{9} \times 21 = \frac{28}{3}$

For Total surface area use

$area = 2\pi {r}^{2} + \pi \: r \sqrt{ {r}^{2} + {h}^{2} }$