book Maths Puzzle Numerical Ability

I need some help. Please. I am trying to figure out the circumference formula for r. If Y1 is the circumference, what expression involving Y1 equals the radius?

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Please verify my answer is correct for this system of inequalities:

x<-2
y&#8805;3/5x-3
y&#8805;-7
x>-8

After grphing my points of intersection wwere (-4, -2) and (-7, -8) p=c-i=i