Find the area $ A $ of a circle if diameter $d = 36$.
Answer
$A = 324\pi$
Explanation
STEP 1: find radius $ r $
To find radius $ r $ use formula:
$$ d = 2 \cdot r $$After substituting $ d = 36 $ we have:
$$ 36 = 2 \cdot r $$ $$ r = \dfrac{ 36 }{ 2 } $$ $$ r = 18 $$STEP 2: find area $ A $
To find area $ A $ use formula:
$$ A = r^2 \cdot \pi $$After substituting $ r = 18 $ we have:
$$ A = 18^2 \cdot \pi $$ $$ A = 324 \cdot \pi $$This page was created using
Circle Calculator