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¡âPQA ¿¡¼­, ÇÇŸ°í¶ó½º Á¤¸®¸¦ ÀÌ¿ëÇϸé,

PQ^2 = PA^2 + QA^2

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

r^2 + Rr + (R/2)^2 = PA^2 + (R/2)^2 - Rr + r^2

PA = sqr(2Rr)

ÀÌ°í, ¡âPOA ¿¡¼­,

PO^2 = PA^2 + AO^2 = 2Rr + r^2

ÀÌ´Ù. ¶ÇÇÑ,

PO = R - r

À̹ǷÎ,

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

4Rr = R^2

r = R/4

ÀÌ µÈ´Ù.

*** Âü°í¹®Çå[References] ***

r = R/4
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