# Test: Circles I - Challenging

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Question 1:   Find $\alpha$, if $\beta =56°$:
$\alpha =112°$
$\alpha =28°$
$\alpha =50°$
$\alpha =45°$
Question 2:   Find $\sphericalangle AOB$:
$\sphericalangle AOB=60°$
$\sphericalangle AOB=45°$
$\sphericalangle AOB=50°$
$\sphericalangle AOB=40°$
Question 3:   Find $AB$:
$AB\cong \text{15}\text{.95}$
$AB\cong \text{16}\text{.55}$
$AB\cong \text{16}\text{.85}$
$AB\cong \text{15}\text{.45}$
Question 4:   Find $\alpha$:
$\alpha =215°$
$\alpha =200°$
$\alpha =230°$
$\alpha =220°$
Question 5:   Find $\alpha$, where $\beta =43°$
$\alpha =43°$
$\alpha =86°$
$\alpha =42°$
$\alpha =21.5°$
Question 6:   Find $\measuredangle BEC$:
$\measuredangle BEC=60°$
$\measuredangle BEC=67°$
$\measuredangle BEC=62°$
$\measuredangle BEC=55°$
Question 7:   Find $\alpha$:
$\alpha =55°$
$\alpha =62°$
$\alpha =65°$
$\alpha =60°$
Question 8:   Find $\alpha$, if $\alpha =\beta$
$\alpha =75°$
$\alpha =80°$
$\alpha =45°$
$\alpha =90°$
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 $5cm$:
$x=6.62$
$x=3.13$
$x=7.05$
$x=5.88$