Question

Aria totala a unui cilindru circular drept este de 168 π cm^2 . Daca R+G = 14 cm, calculati : R , h , V .

Answer 1

At = 2$\pi$R(G+R) = 168 $\pi$ cm^2
=> R(R+G) = 168 :2 =84
R x 14 = 84 => R = 84: 14 = 6 cm
h = G = 14 - 6 = 8 cm
V = $\pi$ x R x R x G = $\pi$ x 6 x 6 x 8
V = 288 $\pi$ cm^3