Rectilinear figure is formed by:

A. Plane

B. Points

C. Straight Lines

D. Can’t be determined

To determine what forms a rectilinear figure, let's break down the options provided. A rectilinear figure is essentially a shape that is made up of straight lines. Therefore, the correct answer to your question is C. Straight Lines.

Understanding Rectilinear Figures

Rectilinear figures are two-dimensional shapes that consist entirely of straight line segments. These shapes can include various polygons such as triangles, rectangles, squares, and more complex forms like pentagons or hexagons. The key characteristic of these figures is that they do not contain any curves.

Components of Rectilinear Figures

Let’s delve deeper into the components that make up these figures:

• Straight Lines: The fundamental building blocks of any rectilinear figure. Each side of the polygon is a straight line segment.
• Vertices: The points where two straight lines meet. For example, a triangle has three vertices.
• Angles: The space between two intersecting lines at a vertex. Rectilinear figures can have various types of angles, such as right angles in rectangles.

Examples of Rectilinear Figures

To illustrate, consider the following examples:

• Triangle: A three-sided polygon formed by three straight lines.
• Rectangle: A four-sided polygon with opposite sides equal and all angles at 90 degrees, made up of straight lines.
• Hexagon: A six-sided polygon, again formed entirely by straight lines.

Why Other Options Are Incorrect

Now, let’s clarify why the other options do not apply:

• Plane: While a rectilinear figure exists in a plane, it is not formed by a plane itself. A plane is a flat, two-dimensional surface that extends infinitely.
• Points: Points can define the vertices of a rectilinear figure, but they do not form the figure on their own. They are simply locations in space.
• Can’t be determined: This option is not applicable because we can clearly identify that straight lines are the defining elements of rectilinear figures.

Final Thoughts

In summary, rectilinear figures are constructed from straight lines, which connect at points to form various shapes. Understanding this concept is fundamental in geometry, as it lays the groundwork for more complex topics involving shapes and their properties. If you have any further questions or need clarification on any related topics, feel free to ask!