What is the circumference of the earth?
40,075km or  24,855 miles depending on which metric system you use.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: What is the circumference of the earth?
### Input: 
### Response: 40,075km or  24,855 miles depending on which metric system you use.