Find the area enclosed by half a circle.
| Input | What it means |
|---|---|
| Radius (r) | Distance from the center to the circle’s edge; half the diameter. |
A radius of 4 gives area 8π ≈ 25.13 square units.
Use the result to put measurements on a common basis before comparing them or estimating quantities. The original measurement precision still limits the precision of the answer.
Carry the measured values and conversion factors through the calculation first. Round the final result to a precision justified by the original measurements.
Measurement conventions, nominal sizes, density assumptions and purchase rounding can change a practical quantity. Compare the units and assumptions before comparing the numbers.
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