tolong di bantu dan pake cara nya

[tex]v = \pi \times r \times r \times t \\ = \frac{22}{7} \times 7 \times 7 \times 20 \\ = 3080 \: cm ^{2} [/tex]

[tex]v = \pi \times r \times r \times t \\ = \frac{22}{7} \times 7 \times 7 \times 20 \\ = 3080cm {}^{3} [/tex]

r=14/2=7 cm

dan jawabannya C.