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±×¸²°ú °°ÀÌ ÀúÇ× R (¥Ø) ÀÌ ¹«ÇÑ°³°¡ ¿¬°áµÈ °æ¿ìÀÇ ÇÕ¼ºÀúÇ× Rt (¥Ø) À» ±¸ÇÑ´Ù.

¹«ÇÑ°³°¡ ¿¬°áµÇ¾î ÀÖÀ¸¹Ç·Î, »¡°£»ö ºÎºÐÀÇ ÇÕ¼ºÀúÇ×µµ Rt °¡ µÈ´Ù.

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Rt = R*(R+Rt)/(R+R+Rt)

2*R*Rt + Rt^2 = R^2 + R*Rt

R*Rt + Rt^2 = R^2

Rt^2 + R*Rt - R^2 = 0

ÀÌ µÇ°í, ±ÙÀÇ °ø½ÄÀ» ÀÌ¿ëÇÏ¿© Rt ¸¦ ±¸ÇÑ´Ù.

Rt = (1/2)*(-R + (R^2 + 4*R^2)^(1/2)) = (1/2)*(sqr(5) - 1)*R


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Rt = (1/2)*(sqr(5) - 1)*R
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