square centimeters
20 cm times 15 cm = 300 square cm
What is the most appropriate instrument to measure
You would measure it in centimeters.
Meters are bigger than centimeters thus making it easier to measure.
I would use 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
No, measuring a sofa in grams is not appropriate as grams are used to measure weight, not dimensions. It would be more appropriate to measure a sofa in inches or centimeters to determine its size.
You would measure it in centimeters.
If units are in centimeters cubed, you would use a ruler or a measuring tape to measure the length, width, and height of an object in centimeters. You can then multiply these three dimensions together to calculate the volume in cubic centimeters.
It would be more appropriate to measure a book in centimeters as meters might be too large a unit of measurement for a book. Additionally, centimeters provide a more precise measurement for the size of a book.
I would go with inches but you could measure it in centimeters.