STEP 1: find side $ a $

To find side $ a $ use formula:

After substituting $B = 100\, \text{cm}$ we have:

$$ B = a^2 $$ $$ a^2 = 100\, \text{cm} $$ $$ a = \sqrt{ 100\, \text{cm} } $$ $$ a = 10 $$

STEP 2: find lateral surface $ L $

To find lateral surface $ L $ use formula:

$$ L = 2 \cdot a \cdot s $$

After substituting $a = 10\, \text{cm}^0$ and $s = 14\, \text{cm}$ we have:

$$ L = 20 \cdot 14\, \text{cm} $$$$ L = 280\, \text{cm} $$

STEP 3: find total surface $ A $

To find total surface $ A $ use formula:

$$ A = B + L $$

After substituting $B = 100\, \text{cm}$ and $L = 280\, \text{cm}$ we have:

$$ A = 100\, \text{cm} + 280\, \text{cm} $$ $$ A = 100\, \text{cm} + 280\, \text{cm} $$ $$ A = 380\, \text{cm} $$

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