Find the base area $ A_B $ of a cone if diameter $d = 18$ and height $h = 12$.
Answer
$AB = 81\pi$
Explanation
STEP 1: find radius $ r $
To find radius $ r $ use formula:
$$ d = 2 \cdot r $$After substituting $ d = 18 $ we have:
$$ 18 = 2 \cdot r $$ $$ r = \dfrac{ 18 }{ 2 } $$ $$ r = 9 $$STEP 2: find base area $ AB $
To find base area $ AB $ use formula:
$$ AB = r^2 \cdot \pi $$After substituting $ r = 9 $ we have:
$$ AB = 9^2 \cdot \pi $$ $$ AB = 81 \cdot \pi $$This page was created using
Cone Calculator