Which undefined terms are needed to define parallel lines?

Question

anonymous · Answer

Coplanar line
Parallel lines are coplanar lines that do not intersect.

anonymous · Answer

thanks, do you know why a ray is a defined term?

anonymous · Answer

A ray is the part of the line which consists of the given point and the set of all points on one side of the end point.
 A ray is one-dimensional, and has zero width. If you draw a ray with a pencil, examination with a microscope would show that the pencil mark has a measurable width. The pencil line is just a way to illustrate the idea on paper. In geometry however, a ray has no width. 
A ray also has no measurable length, because it goes on forever in one direction.

anonymous · Answer

Jamal wrote the following statements:

Statement 1: Perpendicular lines are two lines that intersect at 90° angles.

Statement 2: All right angles are congruent.

Which geometry term does each statement represent?

 Statement 1: definition; Statement 2: theorem

 Statement 1: postulate; Statement 2: definition

 Statement 1: theorem; Statement 2: postulate

 Statement 1: postulate; Statement 2: theorem
 
please help

anonymous · Answer

Statement 1 : definition ; Statement 2 : theorem

anonymous · Answer

When constructing inscribed polygons and parallel lines, how are the steps similar?

 A protractor and ruler are used to take accurate measurements.

 A compass is used to draw arcs.

 Four right angles are created.

 There are no similarities.

anonymous · Answer

i'm sorry, i don't know that one /:

anonymous · Answer

thanks what about this one

Which step is included in the construction of parallel lines?

 Connect two arcs with a compass.

 Create arcs above the given line with a straightedge.

 Copy an angle by creating arcs with a compass.

 Connect the parallel lines with a straightedge.