melcantojet melcantojet

24-12-2016
Mathematics

Answered

Point O is the center of the circle in the diagram. What is m∠BCA ?

A80°

B75°

C70°

D65°

Verified Answer :

HomertheGenius HomertheGenius

25-12-2016

m ∠ BOA = 360° - 250° = 110°
The sum of all interior angles of the quadrilateral AOBC is 360°
m ∠ BCA = 360° - ( 110° + 90° + 90° ) = 360° - 290° = 70°
Answer: C ) 70°

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