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The distance that the center point moved when the semicircle is rotated one turn

ÀÛ¼ºÀÚ Uploader : ¸ÅÀÏ1´Þ¶ó ÀÛ¼ºÀÏ Upload Date: 2019-01-08º¯°æÀÏ Update Date: 2019-01-08Á¶È¸¼ö View : 339

When a semi-circular figure with a radius of r is rotated one turn, the distance traveled by the center point can be calculated as follows.

In the figure, the dotted line in red is the trace of the moving center point, and the length is as follows.

L = (¥ð/2)*r + ¥ð*r + (¥ð/2)*r = 2*¥ð*r

That is, it is equal to the circumference of a circle with radius r.

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L = 2*¥ð*r
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