Easy. 150 is the number
1/2 of 150 = 75
75 + 150 = 225
13.99 kilometers is the diameter.
Divide the circumference (43.96) by 2(pi), which should give you a radius of 6.99. You should then proceed to multiplying that by 2, since radius is half of the diameter, giving you 13.99.
I have no idea lol who would know that answer
