Test: Circles I - Challenging

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Question 1:   Find α , if β=56° :
α=112°
α=28°
α=50°
α=45°
Question 2:   Find AOB :
AOB=60°
AOB=45°
AOB=50°
AOB=40°
Question 3:   Find AB :
AB15.95
AB16.55
AB16.85
AB15.45
Question 4:   Find α :
α=215°
α=200°
α=230°
α=220°
Question 5:   Find α , where β=43°
α=43°
α=86°
α=42°
α=21.5°
Question 6:   Find BEC :
BEC=60°
BEC=67°
BEC=62°
BEC=55°
Question 7:   Find α :
α=55°
α=62°
α=65°
α=60°
Question 8:   Find α , if α=β
α=75°
α=80°
α=45°
α=90°
Question 9:   Find the diameter CD :
d=9.23
d=8.66
d=9.78
d=10
Question 10:   Find the length of the chord x in a circle with the radius 6cm if perpendicular distance from the chord to the circle center is 5cm :
x=6.62
x=3.13
x=7.05
x=5.88