The answer to this question is 36cm.
Its the first one because everytime you rotate the shape it will stay within the lines
10:100 or 10%
The relative frequency of the people who visited the gift shop AND did not watch the film was .10 which translates to 10:100 which can also be represented as 10%.
Hope that helps.
A cosine equation with 5pi/8 involved brought down by 2. That is the best I can help from what I remember from High School.