12. Multistep Main Street and Washington Avenue meet at a right angle. A
large park begins at this corner. Joe's school lies at the opposite corner of
the park. Usually Joe walks 1.2 miles along Main Street and then 0.9 miles
up Washington Avenue to get to school. Today he walked in a straight
path across the park and returned home along the same path. What is the
difference in distance between the two round trips? Explain.