# Math Help - [SOLVED] cylinder &amp; blueprint

1. ## [SOLVED] cylinder &amp; blueprint

thanks you

Hello,

i have a little excercise to do but i have some difficulty.
Can you help me plz ?!

The length of the rectangle has to fit around the top and base circle. Therefore the length of the rectangle must be the circumference of the circle which is calculated by:

$c = 2\pi \cdot r$