In that case, you must use what is given.
For example, if the circumference is given, then the diameter is [ C / pi ] .
If, instead, the area is given, then the diameter is [ 2 sqrt( A / pi ] .
In any problem-solving situation, fretting about what you don't have
doesn't get you anywhere. Just relax, and use what you dohave.
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The diameter of the semicircle will be twice the radius.
Divide the diameter by 2.
You times the radius by 2.
Divide the diameter by 2.
Diameter = circumference/pi Radius = circumference/2*pi