The meaning of Erastus is Lovely and  Beloved. Its origin is Variant of the Greek name Erastos. Erastus is a form of Erastos and is generally pronounced like eh RAS tus. This name is mostly being used as a boys name. Last year it ranked 4,160th in the U.S. Social Security Administration list of most popular baby boy names.
Which undefined term is needed to define an angle? Plane Point Ray Line. Undefined, you need a line to define an angle (if you're looking for undefined terms). This is because, if you think about it, a ray is part of a line.
Angle of attack (AOA): The acute angle between the chord line of the airfoil and the direction of the relative wind. Report an issue with this definition. AOA or a: Ã¡ the angle between the chord line of the wing of an aircraft and the vector representing the relative motion between the aircraft and the. atmosphereeport an issue with this definition. The acute angle formed between the chord line of an airfoil and the direction of the air that strikes the airfoil. Report an issue with this definition. The acute angle between the chord line of a propeller blade and the relative wind.