Question

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Answer 1

Here your answer goes

Step :- 1

Radius of cone  = 3.5 cm

Total height of the cone

⇒ (15.5 - 3.5) cm

⇒ 12 cm

Step :- 2

Slant height of the cone

$\sqrt{r^{2 + }h^{2}$

⇒ $\sqrt{3.5^{2} + 12^{2}$

⇒ $\sqrt{12.25 +144$

⇒ $\sqrt{1562.5}$

⇒ $\sqrt{(12.5)^{2}$

⇒ 12.5 cm

Step :- 3

In order to find total Surface of area  of the toy we know that ,

C.S.A of the  Cone + C.S.A of the  hemisphere = Total surface area of the toy

(1) C.S..A of the cone => $\pi rl$

⇒ 22/7 * 3.5 * 12.5

⇒ 22 * 0.5 * 12.5

⇒ 137.5 cm^2

(2) C.S.A of hemisphere => $2\pi r^{2}$

⇒ 2 * 22/7 * (3.5)^2

⇒ 77 cm^2

Total Surface area of the toy

⇒ 137.5 + 77

⇒ 214.5 cm^2

Therefore , Total Surface area of the toy is 214.5 cm^2

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Answer 2

Here your answer goes

Step :- 1

Radius of cone  = 3.5 cm

Total height of the cone

⇒ (15.5 - 3.5) cm

⇒ 12 cm

Step :- 2

Slant height of the cone

⇒

⇒

⇒

⇒

⇒ 12.5 cm

Step :- 3

In order to find total Surface of area  of the toy we know that ,

C.S.A of the  Cone + C.S.A of the  hemisphere = Total surface area of the toy

(1) C.S..A of the cone =>

⇒ 22/7 * 3.5 * 12.5

⇒ 22 * 0.5 * 12.5

⇒ 137.5 cm^2

(2) C.S.A of hemisphere =>

⇒ 2 * 22/7 * (3.5)^2

⇒ 77 cm^2

Total Surface area of the toy

⇒ 137.5 + 77

⇒ 214.5 cm^2

Therefore , Total Surface area of the toy is 214.5 cm^2

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