depends on the information given, but radius is half of the diameter.
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By dividing the diameter by 2 will give the circle's radius. Area of any circle = pi*radius squared.
Not enough information is given to work out the radius of the circle as for instance what is the length of sector's arc in degrees
Work it out the circumfrance of a circle is pie x the diameter!
the radius of a circle is r
The radius of a circle is half the circle's diameter