Find the volume $ V $ of a pyramid if side $a = 24$ and slant height $s = 20$.

$V = 3072$

STEP 1: find height $ h $

To find height $ h $ use Pythagorean Theorem:

$$ h^2 + \frac{ a^2 }{ 4 } = s^2 $$

After substituting $ a = 24 $ and $ s = 20 $ we have:

$$ h ^ {\,2} + \frac{ 24^2 }{ 4 } = 20^2 $$ $$ h ^ {\,2} + \frac{ 576 }{ 4 } = 20^2 $$ $$ h ^ {\,2} + 144 = 20^2 $$ $$ h ^ {\,2} = 400 - 144 $$ $$ h ^ {\,2} = 256 $$ $$ h = \sqrt{ 256 } $$$$ h = 16 $$

STEP 2: find volume $ V $

To find volume $ V $ use formula:

$$ V = \dfrac{ a ^{ 2 } \cdot h }{ 3 } $$

After substituting $ a = 24 $ and $ h = 16 $ we have:

$$ V = \dfrac{ 576 \cdot 16 }{ 3 }$$$$ V = \dfrac{ 9216 }{ 3 } $$$$ V = 3072 $$

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