Answers

2015-12-01T20:28:37+08:00
  • Brainly User
2015-12-02T01:54:08+08:00
If two lines intersect at the center of the circle, two pairs of vertical angles (non-adjacent) are formed.  Vertical angles with common vertex at the center of the circle are congruent.  Therefore, the arcs intercepted by each pair of vertical angles are also congruent.

Proof:  Vertical angles theorem with the center as the point of intersection.
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