Assessment and Learning in Knowledge Spaces (ALEKS) Practice Exam

What do you call a three-dimensional geometric figure?

1. A solid

2. A plane

3. A polygon

4. A segment

The correct answer is: A solid

A three-dimensional geometric figure is referred to as a solid. Solids are defined by having length, width, and height, which distinguishes them from two-dimensional figures that only have length and width. Solids include various shapes such as cubes, spheres, cylinders, and pyramids, among others. In contrast, a plane represents a flat, two-dimensional surface that extends infinitely in all directions, while a polygon refers to a two-dimensional shape with straight sides, like triangles and rectangles. A segment specifically pertains to a line segment, which is a part of a line that has two endpoints, and it is also a two-dimensional concept. Therefore, the term "solid" accurately encapsulates the concept of a three-dimensional figure, making it the correct choice.