Identify points and line segments

A point represents an exact location, often identified by a capital letter, while a line segment is the straight path connecting two distinct endpoints, including the endpoints themselves. These ideas support interpreting and labeling geometric drawings, distinguishing a segment from a line that extends indefinitely or a ray with one endpoint, and recognizing segments as the basic parts of polygons and measurable lengths.

Detailed Explanation: Identify points and line segments

A point shows one exact location. It is named with a capital letter, such as $A$ .

A line segment is a straight path connecting two different points. It includes both endpoints. A segment with endpoints $A$ and $B$ is named $\overline{AB}$ or $\overline{BA}$ .

Example

Look at this drawing:

        C
       / \
      /   \
     A-----B

Step 1: Identify the points.
The capital letters mark the points:

A,\ B,\ \text{and } C

So, the drawing has three points.

Step 2: Find each straight path connecting two points.

The path from $A$ to $B$ is $\overline{AB}$ .
The path from $A$ to $C$ is $\overline{AC}$ .
The path from $B$ to $C$ is $\overline{BC}$ .

Step 3: Check the endpoints.
Each segment has two endpoints:

$\overline{AB}$ has endpoints $A$ and $B$ .
$\overline{AC}$ has endpoints $A$ and $C$ .
$\overline{BC}$ has endpoints $B$ and $C$ .

So, the drawing shows 3 points and 3 line segments.

Learn by doing: Identify points and line segments

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Identify Lines, Segments, and Rays - First Time

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