Isosceles Triangle in a Semi-circle
a
65

⊾aco = 90

⊾aco = 60

⊾aco = 80

⊾aco = 65

c
o
b
ab is the diameter of  a circle with centre o.  
Find |⊾aco|
a
65

⊾acb = 80

⊾acb = 100

⊾acb = 65

⊾acb = 90

c
o
b
a
65
⊾aoc = 80

⊾aoc = 100

⊾aoc = 65

⊾aoc = 50

c
o
b
a
65

⊾acb = 80

⊾acb = 100

⊾acb = 65

⊾acb = 90

c
o
b
a
65
⊾bco = 65
⊾bco = 25
⊾bco = 90
⊾bco = 35
c
o
b
a
65
⊾cob = 65
⊾cob = 130
⊾cob = 90
⊾cob = 135
c
o
b
a
65
⊾cbo = 65
⊾cbo = 25
⊾cbo = 90
⊾cbo = 35
c
o
b
a
65

⊾acb = 80

⊾acb = 100

⊾acb = 65

⊾acb = 90

c
o
b
a
65
⊾cob = 65
⊾cob = 130
⊾cob = 90
⊾cob = 135
c
o
b
a
65

⊾acb = 80

⊾acb = 100

⊾acb = 65

⊾acb = 90

c
o
b
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