The circumference of a circle with a radius of 31 meters is about 194.8 meters.
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2*pi*31 square mm or pi*62 square mm
Circumference = 2 * Pi * rr(radius) = diameter/2 = 31/2 = 15.5Circumference = 2 * pi * 15.5= 97.4 units==========( you could call it 97 units )
radius of 31 inches
if the circumference is 31 inches you know that... Diameter = circumference/(pi) D = 31in/3.1 D=10 r= 1/2D r=1/2(10) r=5
A circle with a radius of 31 cm has an area of 3019.07 square cm.