square centimeters
A tape measure that measure in feet and inches (or meters and centimeters) would be most appropriate.
Usually meters would be an appropriate unit.
I would go with inches but you could measure it in centimeters.
In the U.S., picture frames are usually measured in inches by inches (like 8"x11"). The larger number will indicate the longer side. In other countries, this would be given in centimeters by centimeters.
centimeters
square centimeters
20 cm times 15 cm = 300 square cm
Centimeters.
Square centimeters
A tape measure that measure in feet and inches (or meters and centimeters) would be most appropriate.
Usually meters would be an appropriate unit.
What is the most appropriate instrument to measure
Cubic centimeters would be most appropriate for volume
You would measure it in centimeters.
I would go with inches but you could measure it in centimeters.
centimeters
In the U.S., picture frames are usually measured in inches by inches (like 8"x11"). The larger number will indicate the longer side. In other countries, this would be given in centimeters by centimeters.