Let the square ABGF and ACDE discuss the relationship between be and FC outside △ABC.

5.？ As shown in figure 1, ray oc and OD are within ∠AOB, and ∠ AOB = 150, ∠ OC and OD = 30. DivisiON of light OM and on ∠AOD and? Bank of China.

(1) If ∠ AOC = 60, try to compare ∠NOD and ∠ MOC by calculation;

(2) As shown in Figure 2, if ∠COD in Figure 1 rotates clockwise around ∠ O point in ∠AOB.

①? The size of ∠MON is always the same during the rotation. Find the value of ∠MON;

②? As shown in Figure 3, if OC happens to be the angular bisector after rotation of ∠MOA,? Try to explore ∠NOD and ∠MOC? Quantitative relationship of