[tex]r=3,5 cm =\frac{7}{2} cm\\H=4 cm\\\\P_{c}=2\pi r^2+2\pi r*H = 2\pi *(\frac{7}{2} cm)^2+2\pi *\frac{7}{2} cm*4 cm\\ = \frac{49}{2}\pi cm^2+28\pi cm^2 =\frac{49+56}{2} \pi cm^2=\frac{105}{2} \pi cm^2=52,5 \pi cm^2\\\\V=\pi r^2*H=\pi *(\frac{7}{2}cm)^2*4cm=49\pi cm^3[/tex]
