Question

The radius of a right circular cylinder is 5cm and it's height is 9cm. find the curved surface area and total surface area of cylinder​

Answer 1

Answer:

Step-by-step explanation:

Radius of cylinder (r)=7cm

Height of cylinder (h)=15cm

Curved Surface Area =2πrh

=2×(22/7)×7×15

=660cm^2

 

Total Surface Area =2πr(h+r)

=2×(22/7)×7(15+7)

=2×22×22

=968cm^2

Answer 2

$\underline{\underline{\huge{\gray{\tt{\textbf Answer :-}}}}}$

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$\sf\large\bold{\orange{\underline{\blue{ Given :-}}}}$

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• Radius of a right circular cylinder is 5cm

• Height of the right circular cylinder is 9cm

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$\sf\large\bold{\orange{\underline{\blue{ To \: Find :-}}}}$

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• Curved surface area

• Total surface area

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$\sf\large\bold{\orange{\underline{\blue{ Solution :-}}}}$

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$\underline{\bold{\texttt{Curved surface area of cylinder :}}}$

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➜ 2πrh ⚊⚊⚊⚊ ⓵

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Where ,

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• r = Radius

• h = Height

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$\underline{\bold{\texttt{Curved surface area of the given cylinder :}}}$

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• r = 5

• h = 9

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⟮ Putting the above values in ⓵ ⟯

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➜ 2πrh

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➜ $\sf 2 \times \dfrac { 22 } { 7 } \times 5 \times 9$

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➜ $\sf \dfrac { 1980 } { 7 }$

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➨ 282.85 sq. cm.

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• Hence the curved surface area of the given cylinder is 282.85 sq. cm.

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$\underline{\bold{\texttt{Total surface area of cylinder :}}}$

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➜ 2πr(h + r) ⚊⚊⚊⚊ ⓶

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Where ,

$\:\:$

• r = Radius

• h = Height

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$\underline{\bold{\texttt{Total surface area of cylinder :}}}$

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• r = 5

• h = 9

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⟮ Putting the above values in ⓶ ⟯

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➜ 2πr(h + r)

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➜ $\sf 2 \times \dfrac { 22 } { 7 } \times 5 (9 + 5)$

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➜ $\sf \dfrac { 44 } { 7 } \times 5(14)$

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➜ $\sf \dfrac { 44 } { 7 } \times 70$

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➜ 44 × 10

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➨ 440 sq. cm.

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• Hence the total surface area of the given cylinder is 440 sq. cm

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