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Okay so if the line goes through half of the circle it's called the radius. If it goes through the whole thing it's the diameter. The equation to find the circumference is pi times diameter. So the first one is 5pi, second is 4pi, third is 3pi, fourth is 6pi, and the last one is 2pi. 

Circumference is simply:
2*r*π or d*π

r = radius
d= diameter
C = circumference (perimeter of circle)

If d = 5m then C is d*π = 5π meters

If r = 2m then C is 2*r*π = 2*2*π = 4π meters

If d = 3m then C is d*π = 3π meters

If r = 3m then C is 2•r•π = 2*3*π = 6π meters

If d =2m then C is d*π = 2π meters

Step 1: 6x-10=1; step 2: 6x=11