An angle is formed by one end point but with two lines. It's one of the three corners of a triangle. It's whenever a straight line stops and changes direction.
You measure an angle by degrees. A right angle, like the corner of a page, is 90 degrees.
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In geometry, an angle is formed when two rays share a common endpoint, known as the vertex. Angles are measured in degrees (°) or radians (rad) and are typically denoted by a symbol, such as ∠ABC. The size of an angle is determined by the amount of rotation between the two rays, relative to a reference line called the initial side.
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.
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