alleryWhich consecutive-angle list can describe a convex cyclic quadrilateral?
A80°,120°,60°,100°
B80°,110°,70°,100°
C80°,100°,90°,90°
D80°,90°,100°,90°
Answer & Solution
Correct answer: D. 80°,90°,100°,90°
Only the list 80°,90°,100°,90° has both opposite-angle sums equal to 180°.
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