Fill in the blanks.
The length of the boundary of a closed figure is called___________.
The length of the boundary of a closed figure is called perimeter.It is the sum of the boundary length of a closed figure.
Question 10
Fill in the blank to make the statement true.
The amount of region enclosed by a plane closed figure is called ___ .
The length of the boundary of a closed figure is called perimeter.
The length of the total boundary of a closed figure is called its area.