Find the area $ A $ of a cylinder if radius $r = 11$ and height $h = 25.8$.

$A = 1327.8654$

STEP 1: find base area $ AB $

To find base area $ AB $ use formula:

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

After substituting $ r = 11 $ we have:

$$ AB = 11^2 \cdot \pi $$ $$ AB = 121 \cdot \pi $$

STEP 2: find lateral area $ AL $

To find lateral area $ AL $ use formula:

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

After substituting $ r = 11 $ and $ h = 25.8 $ we have:

$$ AL = 22 \cdot 25.8 \cdot \pi $$$$ AL = 567.6\pi $$

STEP 3: find area $ A $

To find area $ A $ use formula:

$$ A = 2 AB + AL $$

After substituting $ AB = 121\pi $ and $ AL = 567.6\pi $ we have:

$$ A = 2 \cdot 121\pi + 567.6\pi $$ $$ A = 242\pi + 567.6 $$ $$ A = 1327.8654 $$

Cylinder Calculator