Question

fill in the blank with an appropriate word, phrase, or symbol(s).
a closed figure in a plane determined by three or more straight line segments is called a ______.

a closed figure in a plane determined by three or more straight line segments is called a

Explanation:

In geometry (a subfield of Mathematics), a polygon is defined as a closed figure in a plane formed by three or more straight line segments (sides) that are connected end - to - end, with each segment intersecting exactly two others (at vertices). So based on this geometric definition, the appropriate term to fill in the blank is "polygon".

Answer:

polygon