The circumference follows the formula C= 2 (pi)R R is the radius which is half the diameter when we put this into the equation we get C = 2 (pi)(4.5) C=28.274334
Circumference is basically pi x diameter or pi x 2(radius) in this situation it would be easier to multiple pi by 9 . this would tell you what the circumference is . pi x 9 = <span>28.2743338823
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.
