alleryA quadrilateral whose four corners lie on one circle has opposite angles adding to what?
A180°
B90°
C360°
D270°
Answer & Solution
Correct answer: A. 180°
1. A quadrilateral with vertices on a circle is cyclic.
2. A convex quadrilateral is cyclic exactly when opposite angles sum to 180°.
3. 360° is the total of all four angles, not of one opposite pair.
_Source: Wikipedia, Quadrilateral, Convex quadrilateral_
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