Question 1: The circumference of a ________ can be calculated from its diameter using the formula:  

Question 2: The circumference of an ellipse is more problematic, as the exact solution requires finding the ________.  

Question 3: In ________ the circumference of a graph refers to the longest cycle contained in that graph.  

Question 4: This can be achieved either via numerical integration (the best type being ________) or by one of many binomial series expansions.  

Question 5: The circumference is the distance around a closed ________.  

