To solve each problem, simply count the number of units the line segment spans.
Be sure to pay attention to the numbers that label each unit.

Example 1: Horizontal line

Find the length of the line segment.

Length:

The line segment spans 3 units across (left to right) and each unit has a length of 1.
So, the line segment has a length of 3.
Length:

Example 2: Vertical line

Find the length of the line segment.

Length:

The line segment spans 8 units (top to bottom) and each unit has a length of 1.
So, the line segment has a length of 8.
Length: