You are standing 50 feet from the center of a circular swimming pool. The distance from you to a point of tangency is 25 feet. What is the approximate radius of the pool?
Answer: Factors of 400 = 1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200 and 400. Factors of 401 = 1 and 401. Hence, the common factor of 400 and 401 is 1.
