Describe how you would like to measure the circumference of a cilinder using a thread and a meter rule

Closely wrap the thread 10 times around a cylinder.

- use the Meter rule to measure the beginning and the end

- Repeat three times and get the average length i.e the circumference

- Use the formulae ??/??= D to find the diameter

Explanation:

You first wrap the threat around the cylindrical object.At the point were the thread meets its beginning place a mark.Remove the threat and using a ruler measure its length ,this gives the outer circumference of the cylindrical object

30 and 44 are b

explanation:

in the 1800s, chinese workers migrated to the united states, first to work in the gold mines, but also to take agricultural jobs, and factory work, especially in the garment industry. chinese immigrants were particularly instrumental in building railroads in the american west, and as chinese laborers grew successful in the united states, a number of them became entrepreneurs in their own right. as the numbers of chinese laborers increased, so did the strength of anti-chinese sentiment among other workers in the american economy. this finally resulted in legislation that aimed to limit future immigration of chinese workers to the united states, and threatened to sour diplomatic relations between the united states and china.