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Among inscribed circles inside a circle, calculation of the radius of a smaller circle

ÀÛ¼ºÀÚ Uploader : ¿¬±¸´ë»ó ÀÛ¼ºÀÏ Upload Date: 2018-08-25º¯°æÀÏ Update Date: 2018-08-27Á¶È¸¼ö View : 276

As shown in the figure, there are two inscribed circles of radius R inside a circle of radius 2R. Then, the radius r of  a smaller incribed circle between these circles is calculated as below.

By the Pithagorean theorem,

R^2+(2R-r)^2 = (R+r)^2

R^2+4R^2-4Rr+r^2 = R^2+2Rr+r^2

4R^2 = 6Rr

4R = 6r

r = 2R/3


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r = 2*R/3
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