28 of45 Fuselage Size Training
 

Radius is the measurement from any point on a circle to its exact center - the radius equals half the diameter.

radius
 

Diameter is the measurement from any point on a circle, directly across the center, making two equal halves.

diameter
  You can find the area of a circle if you know the radius or the diameter. If you only know the diameter, dividing it in half makes it equal to the radius.
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