Question

2 why is the straightedge of a ruler not the same as a line? the straight edge of a ruler is not

Explanation:

A line in geometry is an abstract concept, extending infinitely in both directions with no thickness. The straight - edge of a ruler is a physical object with definite length and thickness.

Answer:

A line is an abstract, infinite, and thickness - less concept, while the straightedge of a ruler is a physical, finite - length object with thickness.