STEP 1: find height $ h $
To find height $ h $ use formula:
$$ h = 2 \cdot r $$After substituting $ r = 6 $ we have:
$$ h = 2 \cdot 6 $$ $$ h = 12 $$STEP 2: find area $ A $
To find area $ A $ use formula:
$$ A = a \cdot h $$After substituting $ a = 11 $ and $ h = 12 $ we have:
$$ A = 11 \cdot 12 $$$$ A = 11 \cdot 12 $$$$ A = 132 $$