Answer:
13
Step-by-step explanation:
It is a square so the length of 1 side =
= 13
The <u>correct answer</u> is:
line.
Explanation:
In Euclidean geometry, there are 3 terms that are considered "undefined": point, line and plane.
They are considered undefined because they are described, but not every formally defined.
The other terms in this question, pyramid, square and triangle, are all formally defined.