Find the area $ A $ of a cylinder if radius $r = 8.5$ and height $h = 13.2$.

$A = 368.9$

STEP 1: find base area $ AB $

To find base area $ AB $ use formula:

$$ AB = r^2 \cdot \pi $$

After substituting $ r = 8.5 $ we have:

$$ AB = 8.5^2 \cdot \pi $$ $$ AB = 72.25 \cdot \pi $$

STEP 2: find lateral area $ AL $

To find lateral area $ AL $ use formula:

$$ AL = 2 \cdot r \cdot h \cdot \pi $$

After substituting $ r = 8.5 $ and $ h = 13.2 $ we have:

$$ AL = 17 \cdot 13.2 \cdot \pi $$$$ AL = 224.4\pi $$

STEP 3: find area $ A $

To find area $ A $ use formula:

$$ A = 2 AB + AL $$

After substituting $ AB = 72.25\pi $ and $ AL = 224.4\pi $ we have:

$$ A = 2 \cdot 72.25\pi + 224.4\pi $$ $$ A = 144.5 + 224.4 $$ $$ A = 368.9 $$

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