Răspuns:
Explicație pas cu pas:
3)
a)
arc AD= 360°-( 150+60+110)= 40°
arc ADC= 150+60=210°
arc BCD=40+150=190°
arc ABC=40+110=150°
arc BAD= 110+60=170°
b)
∡ADC= (150+60) :2= 210:2= 105°
∡BCD= (150+40):2= 190°:2= 95°
∡ABC= (110+40):2= 150:2=75°
∡BAD= (110+60):2= 170:2= 85°
c)
∡CAB= arc BC/2= 60/2=30°
∡CAD= arc CD /2 = 110/2=55°
∡ADB= 150/2=75°
∡BDC=m60/2=30°
∡DCA= 40/2=20°
∡ACB= 150:2=75°
