STEP 1: find radius $ r $
To find radius $ r $ use formula:
$$ d = 2 \cdot r $$After substituting $ d = 5.6 $ we have:
$$ 5.6 = 2 \cdot r $$ $$ r = \dfrac{ 5.6 }{ 2 } $$ $$ r = 2.8 $$STEP 2: find volume $ V $
To find volume $ V $ use formula:
$$ V = r ^{ 2 } \cdot h \cdot \pi$$After substituting $ r = 2.8 $ and $ h = 7.1 $ we have:
$$ V = 2.8 ^{ 2 } \cdot 7.1 \cdot \pi$$$$ V = 7.84 \cdot 7.1 \cdot \pi $$$$ V = 55.664\pi $$