Cleave Books
The Circles Calculator
Show values to . . . significant figures.
areasquare units
semi-circle areasquare units

Remember: Appropriate units need to be attached.
Very large and very small numbers appear in e-Format.
Unvalued zeros on all numbers have been suppressed.
Display of original input has NOT been adjusted in any way.
A note on Format and Accuracy is available.

Additional Information
A semi-circle (or semicircle) is simply one-half of circle.
It can also be thought of as a sector with an angle of 180 degrees.
If the perimeter of the semi-circle is needed, add together the lengths of
one-half of the circumference + diameter

Where (for brevity) it says 'radius', 'circumference' and so on, it should, more correctly, be something like 'length of radius' or 'size of circumference' etc.

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Version 1.4