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.
Forexample, in a headwind or sinkingair mass, the flight path angle AERO 13 Angle of attack (AOA) is theangle between the oncoming air or relative wind and a reference lineon the airplane or wing. Sometimes,the reference line is a line connect-ing the leading edge and trailingedge at some average point on thewing.