STEP 1: find side $ l $

To find side $ l $ use Pythagorean Theorem:

$$ r^2 + h^2 = l^2 $$

After substituting $r = 7\, \text{cm}$ and $h = 14\, \text{cm}$ we have:

$$ \left( 7\, \text{cm} \right)^{2} + \left( 14\, \text{cm} \right)^{2} = l^2 $$ $$ 49\, \text{cm}^2 + 196\, \text{cm}^2 = l^2 $$ $$ l^2 = 245\, \text{cm}^2 $$ $$ l = \sqrt{ 245\, \text{cm}^2 } $$$$ l = 7 \sqrt{ 5 }\, \text{cm} $$

STEP 2: find Curved Surface Area $ CSA $

To find Curved Surface Area $ CSA $ use formula:

$$ CSA = l \cdot r \cdot \pi$$

After substituting $r = 7\, \text{cm}$ and $l = 7 \sqrt{ 5 }\, \text{cm}$ we have:

$$ CSA = 7 \sqrt{ 5 }\, \text{cm} \cdot 7\, \text{cm} \cdot \pi$$$$ CSA = 7 \sqrt{ 5 }\, \text{cm} \cdot 7\, \text{cm} \cdot \pi $$$$ CSA = 49 \sqrt{ 5 }\pi\, \text{cm}^2 $$

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