The angle between the internal
bisector of one base angle and
the external bisector of
another base angle of a triangle
is equal to 40 degree. Find the
vertical angle of the triangle.
1 point
60 degree
70 degree
80 degree
20 degree
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Answer:
rove that the angle between internal bisector of one base angle and the external bisector of the other base angle of a triangle is equal to one half of the vertical angle. ∠E=12∠A.
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