Dan walks around the block. The block is 200 feet wide and 800 feet long. How many feet did he walk?

You can find the constant of proportionality by finding the ratio of

Martha is training for a duathlon, which includes biking and running. she knows that yesterday she covered a total distance of over 55.5 miles in more than than 4.5 hours of training. martha runs at a speed of 6 mph and bikes at a rate of 15.5 mph.

What are the triple angle formulas? is it related to double angle identities?