If domestic vehicles outnumber foreign vehicles by about three to two and vehicles in a country are 1925 then Domestic vehicles would be {(1925)x(3/5)} = 1155
The total circle has a measure of 2π radian, so this portion is 1/(2π) of the whole circle the circumference of the whole circle is 2πr 1/(2π) of 2πr=3.07 r=3.07
