Answer:
y=180-63-63/2=27degree...in triangle mln
x=180-27-63=90....in triangle mon
Step-by-step explanation:
Initial expression = 80 + 78 + (-97) + 12
final expression = 170-97 ==> $73
∠QRS and ∠CDE are congruent.
∠RST and ∠DEB are congruent.
∠STQ and ∠EBC are congruent.
∠TQR and ∠BCD are congruent.
You can conclude the above angles are congruent because ∠R and ∠D has the same sign on their angle and so does ∠S and ∠E.