a) A situation in contrast would be where there is no angle created when the rays are parallel to a shared terminal.
b) 'The plane' is an example of a term without a formal definition and a term that lacks a defined meaning. A plane is pertaining to an angle since it provides the measurement parameter.
What is an angle?
When two straight lines or rays intersect at a single endpoint, an angle is created. The vertex of an angle is the location where two points come together. Thus, to make the given definition for angles more accurate, we can say,
"An angle is two non-collinear rays with a common end point."
Two rays that are parallel to a shared terminal presents an example contradicting the given definition of an angle.
Undefined Term Related to Angles
If we take the example of the phrase, 'the plane', we can see that it has no formal definition. Though, angles are formed when planes intersect, so planes help us in giving measurement of an angle.
Learn more about an angle here:
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