What does this number measure?
The NASA/JPL launch press kit of 2020 gives the rover a length of about 3 m, excluding the robotic arm. Its width is about 2.7 m and its height 2.2 m. The drawing's width compares the body and running gear; the arm is folded in this view and does not add its 2.1 m reach to the dimension. Antennas, wheels and instruments are interpreted.
Compare the stated dimensions
The comparison uses the number in each fact sheet: altitude, height, diameter, length or distance, depending on the reference. Two values in metres do not necessarily describe the same property.
Source and limitations
Rounded dimensions from mission documentation. The arm's position changes the overall envelope; the reference length explicitly excludes it.
Interpreted profile view of Perseverance with its arm folded. Calibrated approximate documented rover length; extended arm excluded, artistic mechanical details.
