The answer depends on whether 5m refers to the radius or diameter.
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Radius of circle: 5/2*pi m
radius = 5 m so circumference = 2*pi*r = 31.4159 m (to 4 dp)
c = 2 pi r = 2 x 3.14 x 5 =31.4 m
15.70 meters Circumference = diameter x pi 5 meters x 3.14 15.70 meters
-7m - 3m + 5m = -5m