STEP 1: find radius $ r $
To find radius $ r $ use formula:
$$ d = 2 \cdot r $$After substituting $ d = 0.8 $ we have:
$$ 0.8 = 2 \cdot r $$ $$ r = \dfrac{ 0.8 }{ 2 } $$ $$ r = 0.4 $$STEP 2: find volume $ V $
To find volume $ V $ use formula:
$$ V = r ^{ 2 } \cdot h \cdot \pi$$After substituting $ r = 0.4 $ and $ h = 1.8 $ we have:
$$ V = 0.4 ^{ 2 } \cdot 1.8 \cdot \pi$$$$ V = 0.16 \cdot 1.8 \cdot \pi $$$$ V = 0.288\pi $$