Răspuns:
Explicație pas cu pas:
arcDE=90°⇒∡DFE =90/2 =45°
arcDF=150°⇒∡DEF=150/2 =75°
∡EDF 180 -(75+45) =60°
DM= bisect. ∡EDF ⇒∡EDM=60/2 =30° (arcEM=MF =60°)
∡EMD=arcED/2 =90/2 =45°
∡DMF=arcDF/2=150/2 =75°
∡MFD= arcDE+EM/2 =90+60/2 =75°
∡MEF =arcMF/2 =60/2 =30°
