solve it nd find angle BAT
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Solution
<CAB=90°
and
<BCA=50°
therefore...
<BAC=180°-(50°+90°)=40°
now AT is tangent to the circle at point T so
AT is perpendicular to OA
so <OAT=90°
therefore...
<BAT=90°-40°=50°
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50⁰
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