i am not too sure if i am correct in this but i will give it a go. i apologise if i am incorrect. In finding the diameter the equation C/π. in finding the radius the equation is (C/π)/2
Part 1 Q2) c=650πcm 650 X π= c so d must be 650cm Q4) c=241πcm 241 X π= c so d must be 241 Q6) c=802cm c/π=d =802/π= 255.28cm (2DP) Q8) c=962cm c/π=d = 962/π= 306.21cm (2DP)