Diameter, the line that dissects the circle exactly in half.
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Radius(r) is equal to 1/2 the diameter(d) d=2r or r=1/2d
It is equal to 2 r or D, where r= radius and D = diameter of the circle.
The radius of a circle with diameter or 8 inches is 4 inches. The diameter equals 2 times the radius or d=2*r. --> 8 in = 2*r so, r = 4 in
Diameter divided by 2 equals radius r=d/2 For example, if the radius was 3.5, the diameter would be 7.
C=2Pi(r) 2*3.14 (which is pi) = 2*3.14 x r Radius would equal one unit. if the radius equals one, the Area equals pi (~3.14) units squared