alleryIn a cyclic quadrilateral, which pair of angles adds up to 180 degrees?
AAdjacent angles
BOpposite angles
CEvery pair
DNo pair at all
Answer & Solution
Correct answer: B. Opposite angles
1. A cyclic quadrilateral has all four vertices on one circle.
2. A convex quadrilateral is cyclic if and only if opposite angles sum to 180 degrees.
3. Adjacent angles do not generally sum to 180.
_Source: Wikipedia, Quadrilateral, section Convex quadrilateral_
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