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Circumference
01
円周
the distance around the external boundary of something
Example
She measured the circumference of the tree trunk to determine its age.
The athlete completed a lap around the track, covering the entire circumference in record time.
To estimate the size of the pond, we measured the circumference using a measuring tape.
02
円周
(geometry) the length of the external boundary of a curved shape, especially a circle
Example
The mathematician used the circumference to solve the geometry problem.
The teacher explained that the circumference is different from the area of a circle.
To find the circumference of a wheel, you need to know its radius or diameter.
03
周囲
the boundary line encompassing an area or object
例
She measured the circumference of the tree trunk to determine its age.
The athlete completed a lap around the track, covering the entire circumference in record time.
To estimate the size of the pond, we measured the circumference using a measuring tape.
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