Question

what is the surface area of cylinder when radius is 7 cm and height is 14 cm​

Answer 1

Answer:

Total surface area =  2pie * radius (radius + height )

= 2*22/7*7(7+14)

= 44*21

920 cm square.

Hope you find it helpful.

Answer 2

$\sf{Given}\left\{ {{Radius\;=\;7 \;cm} \atop {\;Height\;=\;14\;cm}} }\right\\ \\ \\ \sf{To\;find:\;\;Surface \;area\;of\;cylinder}$

Where,

• π = 22/7
• SA of cylinder = Surface area of cylinder
• r = radius
• h = height

$\sf{Required\;formula:}\\ \\ \\\red{\bigstar}\;\underline{\boxed{\sf{Surface\;area\;of\;cylinder\;=\;2\pi r(r+h)}}}$

Putting the values,

$\\ \dashrightarrow\;\sf{SA \;of\;cylinder=2\times \frac{22}{7}\times 7(7+14)}\\ \\ \dashrightarrow\;\sf{SA \;of\;cylinder=2\times \frac{22}{\cancel{7}}\times\cancel{7}\times(21)}\\ \\ \dashrightarrow\;\sf{SA \;of\;cylinder=2\times 22 \times 21}\\ \\ \dashrightarrow\;\sf{SA \;of\;cylinder=44\times 21}\\ \\ \dashrightarrow\;\sf{SA \;of\;cylinder=924\;cm^2}$

• ∴ Hence,The Surface area of cylinder is 924 cm².

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