In all isosceles triangles, the exterior angle of a base angle must always be
A a right angle
B an acute angle
C an obtuse angle
D equal to the vertex angle

Manuela claims that and are congruent. which statement best describes her claim? she is incorrect because the segments do not have the same orientation. she is incorrect because the segments do not have the same length. she is correct because the segments have the same length. she is correct because the segments have the same orientation.