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a.) <CAB = 180 - 110
<CAB = 70°

<CBA = 180 - 125
<CBA = 55°

180 = <CAB + <CBA + <ACB (*segitiga)
180 = 70 + 55 + <ACB
180 = 125 + <ACB
<ACB = 180-125
<ACB = 55°

b.) <DCB = 180 - <ACB
<DCB = 180 - 55
<DCB = 125°