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h=8cm
pole=½ah=40cm²
½×8a=40
a=40:4
a=10cm
r=5cm
v=⅓πr²h=⅓π×5²×8=66⅔πcm³
z pitagorasa obliczam l
l²=8²+5²
l²=64+25
l²=89
l=√89
pole=πr²+πrl=π×5²+π×5×√89=25π+5√89π=5π(5+√89)cm²