Question

dau coroana pentru cine ma ajuta

Answer 1

a) arc AD=360-(140+60+120)=40°

arc BCD=60+120=180°

arc ADC=40°+120°=160°

arc DAB=40°+140°=180°

arc ABC=140°+60°=200°

b) <ADC=70°+30°=100°

<DCB=30°+60°=90°

<CBA=60°+20°=80°

<BAD=20°+70°=90°

c) <DAC=90°-45°=45°

<CAB=90°45°

<BCA=15°+60°=75°

<DCA=30°:2=15°

<ADB=100°-50°=50°

<CDB=100°-50°=50°

<ABD=180°-140°=40°:2=20°

<CBD=60°+20°

Answer 2

Răspuns:

Explicație pas cu pas:

a)

arc AD= 360-(140+60+120)=40°

arc BCD=140+40=180

arc ADC= 40+120=160°

arc ABC=120+40=160

arc DAB=120+60=180°

arc CDA= 140+60=200°

b)

∡DAB=180:2=90°

∡ABC=160:2=80°

∡BCD=180:2=90°

∡ADC=200:2=100°

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c)

∡CAB=60:2=30°

∡ABD=40°:2=20°

∡DBC=120:2=60°

∡CDB=60:2=30°