jellybean1717
jellybean1717 jellybean1717
  • 13-10-2018
  • Mathematics
contestada

Point O is the center of this circle, what is mBCA?

A) 56
B) 62
C) 72
D) 76

Point O is the center of this circle what is mBCA A 56 B 62 C 72 D 76 class=

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skyeblu7 skyeblu7
  • 13-10-2018
answer: B.) 62

sum of interior angles of quadrilateral = 360

lines DB and DA are tangent to the circle, so they're at a right angle to the lines OB and OA respectively. so to find mBOA = 360 - 56 - 90 - 90
so mBOA = 124

mBCA = (1/2)mBOA
mBCA = (1/2)(124)
mBCA = 62°
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