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ÈáõÍáõÙ£ î³ñ³ÍáõÃÛ³Ý Ù»ç áõÕÕ³ÝÏÛáõÝ Ïááñ¹Çݳï³ÛÇÝ Ñ³Ù³Ï³ñ·Ý<br />
ÁÝïñ»Ýù Ñ»ï¨Û³É Ï»ñå. B Ï»ïÁ<br />
ѳٳñ»Ýù Ïááñ¹ÇݳïÝ»ñÇ ëϽμ-<br />
ݳϻï, Ox ³é³ÝóùÇ ¹ñ³Ï³Ý ÏÇë³é³Ýóù<br />
ѳٳñ»Ýù BA ׳é³-<br />
·³ÛÃÁ Oy ³é³ÝóùÇ ¹ñ³Ï³Ý Ïdzé³ÝóùÁª<br />
BC ׳鳷³ÛÃÁ, ÇëÏ Oz<br />
³é³ÝóùÇ ¹ñ³Ï³Ý ÏÇë³é³ÝóùÁª<br />
BB 1 ׳鳷³ÛÃÁ (ÝÏ. 48)£<br />
Ü߳ݳϻÝù MA 1 = a, áõëïÇ<br />
AM = 3a ¨ AA 1 = 4a£ л勉μ³ñ M,<br />
N, D ¨ D 1 Ï»ï»ñÁ ÏáõݻݳÝ<br />
ÜÏ. 48<br />
Ñ»ï¨Û³É Ïááñ¹ÇݳïÝ»ñÁª<br />
M(4a; 0; 3a), N(0; 2a; 0), D(4a; 4a; 0), D 1 (4a; 4a; 4a)<br />
Àëï »ñÏáõ Ï»ï»ñ ÙdzóÝáÕ í»ÏïáñÇ Ïááñ¹ÇݳïÝ»ñÇ μ³Ý³Ó¨»ñǪ<br />
!N#M(4a; −2a; 3a)<br />
!D#D 1 (0; 0; 4a)<br />
Ü߳ݳϻÝù ³Ûë í»ÏïáñÝ»ñáí ϳ½Ùí³Í ëáõñ ³ÝÏÛáõÝÁ ϕ-áí£ Àëï ëϳÉ-<br />
Û³ñ ³ñï³¹ñÛ³ÉÇ ë³ÑÙ³Ýٳݪ<br />
!N#M · !D#D 1<br />
4a · 0 − 2a · 0 + 3a · 4a<br />
cos ϕ = −−−−−−−−−−− = −−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−−− =<br />
⎥!N#M⎥ · ⎥D#D ! 1 ⎥ √"(4"a) " 2 +" ("−2"a") 2 "+" ("3"a$) 2 · √"0 2 "+"0 2 "+""(4"a$) 2<br />
12a 2 3<br />
= −−−−−−−−−−−− = −−−−£ ∇<br />
√"29$a 2 · √"16$a 2 √$29<br />
ÊݹÇñÝ»ñ, ³é³ç³¹ñ³ÝùÝ»ñ, ѳñó»ñ<br />
1.° гñÃáõÃÛ³Ý íñ³ ïñí³Í »Ý A ¨ B Ï»ï»ñÝ, Áݹ áñáõÙ AB = 2£ ï»ù<br />
ѳñÃáõÃÛ³Ý ³ÛÝ Ï»ï»ñÇ »ñÏñ³ã³÷³Ï³Ý ï»ÕÁ, áñáÝó ѳٳñ AM 2 + BM 2 = 2<br />
(ä³ï. AB-Ç ÙÇçݳϻïÁ Ï»ÝïñáÝ áõÝ»óáÕ ¨ /−− $1 ß³é³íÕáí ßñç³Ý³·ÇÍ)<br />
2<br />
2.° (û) îñí³Í ¿ ABCD áõÕÕ³ÝÏÛáõÝÁ£ ²å³óáõó»ù, áñ ѳñÃáõÃÛ³Ý ó³Ýϳó³Í<br />
M Ï»ïÇ Ñ³Ù³ñ ï»ÕÇ áõÝÇ AM 2 + CM 2 = BM 2 + DM 2 å³ÛÙ³ÝÁ£<br />
3.° ABC áõÕÕ³ÝÏÛáõÝ »é³ÝÏÛ³Ý AC ¨ BC ¿ç»ñÁ ѳٳå³ï³ë˳ݳμ³ñ<br />
ѳí³ë³ñ »Ý 1 ¨ 3£ ï»ù ѳñÃáõÃÛ³Ý ³ÛÝ M Ï»ï»ñÇ »ñÏñ³ã³÷³Ï³Ý ï»-<br />
ÕÁ, áñáÝó ѳٳñª<br />
75