meters
in centimeters
With recorded lengths of just over 100 feet, you could measure a Blue Whale in either meters or yards and feet.
A ruler
i would use inches
It's a measure of width, 200cm, 2000mm, and about the length of your arm times two to give a very rough guide. Multiply it by the measure of height (and/or breadth) to get the volume.
You would use a measuring tape, with measurements in centimetres.
The area of Norris Arm is 41.49 square kilometers.
The area of Salmon Arm is 155.28 square kilometers.
Arm span is a measure of the arm
Roughly 1
usually a arm would be compared to whatever they were trying to measure.
The area of Roddickton-Bide Arm is 47.71 square kilometers.