As one of the contributors noted, I would like to also state that if these are home works that students are asked to do by their teachers (school work) it defeats the purpose of the homework. Instead of solving the problem I will give hints. Staff who monitor and moderate this site, please give contributors some guidelines please.
Find the area of the 20cm diameter circle. Divide it by the area of the 6mm diameter circle. If you get a whole number, that is the answer. If not round it down to the nearest whole number.
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zero
True, but many people nowadays like semi-circles instead.
It varies. There is no set diameter of a circle.
1^2 or 2^2 or 3^2 or 4^2.... and it goes on...where diameter of circle is equal to the side of square divided by square root of total numbers of circles.. eg : side of square = 10 no of circles = 2^2 square root = 2 therefore diameter = 10/2=5.
Multitude