B3 (2) ∠ROF = 6∠EOS, ∠EOS = 50% ∠FOE. ∠ROF, ∠EOS - ?

∠EOS = 0.5 ∠FOE. ∠ROF = 6 ∠EOS = 6 * 0.5 ∠FOE = 3 ∠FOE. ∠ROF + ∠FOE + ∠EOS = 180°. 3 ∠FOE + ∠FOE + 0.5 ∠FOE = 180°. 4.5 ∠FOE = 180°. ∠FOE = 180° / 4.5 = 40°. ∠EOS = 0.5 * 40° = 20°. ∠ROF = 6 * 20° = 120°. ∠ROF = **120°** ∠EOS = **20°**