An angle has 3 parts.
Two intersecting lines/line segments and the point
of intersection (called the vertex of the angle.)
The amount of rotation required to bring one of the
line segments to coincide with the other is called
the value the angle. The most common units of measuring angles are degrees and radians.
http://www.mathopenref.com/angle.html
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first angle projection and third angle projection.
A right angle might be described as a ninety-degree angle. It can also be described as perpendicular or orthogonal.
A straight line is equal to a 180 degree angle.
High angle is when the camera looks down on someone or something.
Use a plastic compass to determine the angle of the roof in relation to the horizontal, then find the pitch based on the angle. Angle to pitch ratios are available on the web.