Find the lateral area $ L $ of a pyramid if slant height $s = 5$ and base radius $r = 3$.
Answer
$L = 60$
Explanation
STEP 1: find side $ a $
To find side $ a $ use formula:
$$ r = \dfrac{ a }{ 2 } $$After substituting $ r = 3 $ we have:
$$ 3 = \dfrac{ a }{ 2 } $$ $$ a = 3 \cdot 2 $$ $$ a = 6 $$STEP 2: find lateral surface $ L $
To find lateral surface $ L $ use formula:
$$ L = 2 \cdot a \cdot s $$After substituting $ a = 6 $ and $ s = 5 $ we have:
$$ L = 12 \cdot 5 $$$$ L = 60 $$This page was created using
Pyramid Calculator