If the smallest angle of rotation for a regular polygon is 18°, how many sides does polygon have
o
4
o 10
o 12
o
20
o
24
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Number of sides of a regular polygon whose smallest angle of rotation is is 20. so correct option is 20.

Solution:

Need to determine sides of a regular polygon having smallest angle of rotation as

In above case smallest angle of rotation is same as central angle of regular polygon.

So now we need to determine number of sides of regular polygon whose central angle is

Number of sides of regular polygon

So for a regular polygon having central angle =

Number of sides =

Hence number of sides of a regular polygon whose smallest angle of rotation is is 20.

37

step-by-step explanation:

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.