D is the vertex.
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it is little bit difficult to explain angle bisector by text because angle bisector is geometry. to help you comprehend, i recommend to follow the link below.this is the video that explain angle bisector clearly.www.brightstorm.com/d/math/s/geometry/u/geometry-building-blocks/t/angle-bisectors
It is an angle that is 90 degrees.
It is the alternate angle to the angle of elevation
straight angle
When the angle is 90 degrees.