, , . .
, , , , . .
, :
- 2 ( );
- 5 ( );
- ;
- .
:
- ;
- , , ;
- , , .
5.7. , .5.9.
. , : 4 - (XA, YA, XC, YC) 4 - (XB, YB, XC ¢, YC ¢), (P, RA, RC), - (R, RC ¢), .
R RC ¢ , , .
. , , RA , R RC ¢ (.5.13).
, , RA R (.5.13).
Oab :
R / P = ()/4; ð R = ()/4; X = - (R )/2 = - P /4; Y = P /4.
½ X ½/ P = 3/4; X = - (3/4) P; Y = - P /4.
5.8. , . 5.11.
. , , , 2 RA (.5.14).
, , RA R , . , RA = R = / ,
X = Y = RA ( /2) = /2; X = Y = - /2.