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= 180 - ( 180 - 2 <ACD)
= 2 < ACD
= 2.20
= 40
b. < AOC = 180 - 2 <ACD
= 180 - 2.20
= 180 - 40
= 140
c. <BOD = <AOC
= 140
3. a. < AOB = 2 <BCA
= 2. 25
= 50
b. < OAB = (180 - <AOB) / 2
= (180-50) / 2
= 130 / 2
= 65
c. < ABC = <ABO + <CBO
= 65 + 15
= 80
d. < BAC = < OAB + <OAC
= 65 + (<BCA - <CBO)
= 65 + (25-15)
= 75
4. a. <P + <R = 90
x + 2x = 90
3x = 90
x = 30
b. < PRQ = 2x
= 2.30
= 60