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.
As a matter of fact that any angle measurement for an arbitrary point on a surface will be. including at least the angle Îf due to the inherent uneven of the surface which defines the. under question flatness and the inclining angle Îi which is the inclination of the table. surface to a reference plane.