Răspuns:
Explicație pas cu pas:
d)
∡COA=90-65=25°
∡COE=∡EOA= 25 :2=24°60' :2=12°30 '
∡DOG=90:2=45°
∡BOD= 180-(90+25)= 65°
∡FOA=180-12°30'=167°30'
∡BOF= 180-167°30'=12°30'
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e))
∡EOA= 90:2=45°
∡GOE= 90°
∡GOC=75°-45°=30°
∡DOG=30°
∡DOB=90-60=30°
∡FOA= 180-45=135°
∡BOF=180-135=45°