Ah, isn't that a lovely question? In a meter, there are 100 centimeters. So, if each ruler is 30 centimeters long, you would need 3 rulers to make up a meter. Just imagine all those rulers lined up, creating beautiful straight lines in your artwork.
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20 rulers
1 metre/30 cm = 100 cm/30 cm = 3.33... recurring.
30 square meters is 300,000 square cm
30
280 cm 1 meter is 100 cm. 2.8 meter * 100 cm/meter = 280 cm