Given the task definition and input, reply with output. Given a math word problem, answer the following question. You might need to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the question and then only report the final numerical answer.

to get to school chad must either walk around a circular lake or canoe across it . the diameter of the lake is 2 miles . how much shorter is his trip if he canoes across the lake rather than walks around it ? ( use the value of pi = 3.14 )
1.14