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<OCB=<OBC=(180-70) : 2 =110 : 2 = 55
<OAC=<OCA=(180-30) : 2 = 150 : 2 = 75
<OAB=<OBA=(180-(30+70)) : 2 = 80 : 2 = 40
<CBA=<CBO - <OBA = 55 - 40 = 15
<ACB=<OCA + <OCB = 75 + 55 = 130
<CAB = 180 - (130+15) = 180 - 145 =35
lub inaczej
<CAB=<OAC - <OAB = 75 - 40 = 35
c)
<CBD = 180-(30+40) = 180 -70 =110
<CBA = 180 - 110 = 70
<OCB=<OBC = 90-40=50
<COB=180-2*50 = 180 - 100 =80
<COB=2<CAB definicja o kącie środkowym i wpisanym
<CAB= 80 : 2 = 40
<ACB=180-(40+70) = 180 - 110 = 70