alleryHow are the internal and external bisectors of one angle related?
AThey are parallel
BThey are perpendicular
CThey are the same line
DThey meet at 60 degrees
Answer & Solution
Correct answer: B. They are perpendicular
1. The internal bisector halves the angle; the external one halves its supplement.
2. Half of the angle plus half of its supplement is 90 degrees.
3. So the two bisectors meet at a right angle.
_Source: Wikipedia, Bisection, section Angle bisector_
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