中英释义：
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圆周率
pi (π); ratio of the circumference of a circle to its diameter
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圆周角
circumferential angle
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圆周速度
circumferential velocity
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圆周力
peripheral force
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圆周运动
circling motion;circular motion
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圆周应力
circumferential/hoop stress
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圆周长
perimeter (of a circle); circumference
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圆周积分
circulation integral
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圆周接缝
circumferential seam
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匀速圆周运动
uniform circular motion
圆的圆周公式是2πr。
The formula for the circumference of a circle is 2πr.
这个圆的圆周是20厘米。
The circumference of this circle is 20 centimeters.
这棵树的圆周大约有三米。
The tree has a circumference of about three meters.
他绕着跑道的圆周跑了五圈。
He ran around the circumference of the track five times.
用卷尺测量这个圆的圆周。
Measure the circumference of the circle with a tape measure.
我们用公式计算了圆的圆周。
We calculated the circumference of the circle using the formula.
他用一根绳子测量了树干的圆周。
He measured the circumference of the tree trunk with a rope.
你能告诉我这个圆的圆周是多少吗？
Can you tell me the circumference of this circle?
这个公式可以帮助你找到任何圆的圆周。
This formula can help you find the circumference of any circle.
地球的圆周大约是40,075公里。
The circumference of the Earth is approximately 40,075 kilometers.