Answer:
The length of the AR is or units.
Step-by-step explanation:
Given the endpoints of a line segment AR
We can calculate the length of AR using the formula
In our case,
Substituting (x₁, y₁) = (8, -2) and (x₂, y₂) = (-4, 1) in the formula
∵ Apply rule:
Apply radical rule:
Apply radical rule:
Therefore, the length of the AR is or units.