Question

a) fill in the blank.
the sum of the lengths of the sides of a two - dimensional figure is called the
the region within the boundaries of a two - dimensional figure is called the

Explanation:

Part a)

In geometry (a subfield of Mathematics), the sum of the lengths of all sides of a two - dimensional figure is defined as the perimeter. This is a fundamental concept in the study of 2D shapes, where we measure the total distance around the figure by adding up the lengths of its sides.

In the context of two - dimensional figures (studied in Geometry, a subfield of Mathematics), the region that is enclosed within the boundaries of the figure is known as the area. Area is used to measure the amount of space that the 2D figure occupies.

Answer:

perimeter

Part b)