Question

Se da: Ab=64$\pi$
V= 128$\pi$. Se cere:R=?; h=?; G=?; Al=?; At=?
Va rog sa ma ajutati!

Answer 1

Ab=πR^2 64π=πR^2 /: π R^2=64 => R= √64 = 8 cm V=πR^2*h 128π=πR^2h/:π 128=R^2h 128=8^2h 128=64h => h=128:64 => h=2 cm G=H => 2 cm Al=2πRG => Al=2π8*2 => => Al=32πcm ^ 2 At= Al+2Ab At= 32π+2*64π At=32π+128π At=160 π cm Sper. Ca te am ajutat!!