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ÀÛ¼ºÀÚ Uploader : ¹Ö±âÀû ÀÛ¼ºÀÏ Upload Date: 2023-07-20º¯°æÀÏ Update Date: 2023-07-20Á¶È¸¼ö View : 285

Type1 Type2
Á¡ P(x1, y1) ÀÇ y = a*x + b ÀÎ Á÷¼±¿¡ ´ëÇÑ ´ëĪÁ¡ Q(x2, y2)ÀÇ ÁÂÇ¥¸¦ ±¸ÇÑ´Ù.

Á¡ P ¿Í Q ¸¦ Áö³ª´Â ¼±ºÐ°ú Á÷¼± y ´Â Á÷±³ÇϹǷÎ, ¼±ºÐ PQ ÀÇ ±â¿ï±â´Â -1/a À̹ǷÎ,

-1/a = (y2-y1)/(x2-x1)

x1-x2 = a*(y2-y1)

x2+a*y2 = x1+a*y1 ------ ¨ç

ÀÌ°í, ¼±ºÐ PQ ¿Í Á÷¼± y ÀÇ ±³Á¡Àº ¼±ºÐ PQ ÀÇ ÁßÁ¡ M(xm, ym) À̹ǷÎ,

xm = (x1+x2)/2
ym = (y1+y2)/2

ÀÌ°í, Á÷¼± y À§¿¡ ÀÖÀ¸¹Ç·Î,

ym = a*xm + b

(y1+y2)/2 = a*(x1+x2)/2 + b

y1+y2 = a*(x1+x2)+2*b

a*x2-y2 = y1-a*x1-2*b ----- ¨è

¨ç+a*¨è ¸¦ Çϸé,

(1+a^2)*x2 = x1+a*y1+a*y1-a^2*x1-2*a*b

x2 = (x1+2*a*y1-a^2*x1-2*a*b)/(1+a^2)

°¡ µÇ°í, ¨ç ¿¡ ´ëÀÔÇÏ¿© y2 ¸¦ ±¸ÇÑ´Ù.

y2 = (x1+a*y1-x2)/a
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¢¹ Q(x2, y2)




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