KoreanSAT / data /json /2025 /math_29_geom.txt
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29. ๋‘ ์ดˆ์ ์ด $\mathrm{F}(c, 0)$, $\mathrm{F'}(-c, 0)$ $(c > 0)$์ธ ์Œ๊ณก์„  $x^2 - \frac{y^2}{35} = 1$์ด ์žˆ๋‹ค. ์ด ์Œ๊ณก์„  ์œ„์— ์žˆ๋Š” ์ œ1์‚ฌ๋ถ„๋ฉด ์œ„์˜ ์  $\mathrm{P}$์— ๋Œ€ํ•˜์—ฌ ์ง์„  $\mathrm{PF'}$ ์œ„์— $\overline{\mathrm{PQ}} = \overline{\mathrm{PF}}$์ธ ์  $\mathrm{Q}$๋ฅผ ์žก์ž.
์‚ผ๊ฐํ˜• $\mathrm{QF'F}$์™€ ์‚ผ๊ฐํ˜• $\mathrm{FF'P}$๊ฐ€ ์„œ๋กœ ๋‹ฎ์Œ์ผ ๋•Œ,
์‚ผ๊ฐํ˜• $\mathrm{PFQ}$์˜ ๋„“์ด๋Š” $\frac{q}{p}\sqrt{5}$์ด๋‹ค. $p+q$์˜ ๊ฐ’์„ ๊ตฌํ•˜์‹œ์˜ค.
(๋‹จ, $\overline{\mathrm{PF'}} < \overline{\mathrm{QF'}}$์ด๊ณ , $p$์™€ $q$๋Š” ์„œ๋กœ์†Œ์ธ ์ž์—ฐ์ˆ˜์ด๋‹ค.) [4์ ]