You have answered this question for yourself; the answer is '10'
Do you mean to ask ; What is the circumference/area of a circle, with a diameter of '10'?.
If so , commit to memory ' elementary school maths.
A = pi r^2
C = 2 pi r or pi d .
From this 2r = d
Hence 2r = 10
r = 5
C = 10 pi = 31.41592.... units
A = pi 5^2 = 25 pi = 78.5398... units^2
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divide by pi which is 3.1415927 and on and on
The radius(radii is the plural) of the circle is half the distance of circle's diameter. The formula is r=(1/2)diameter.
Take the circumference of a circle and divide it by the diameter of that circle: ∏=C/D
in place of r (radius) write d/2 where d is diameter
Area is 4.6 m2