, , [5, .11], [10, .13].
, [5, c. 10].
a || b, α :
α.
1. , [5, .11].
2. , , [10, .14].
, , - , , [5, .12], [ 10, c.13].
,
Ì α || a: a || α.
. , , . [5, .20], [ 10, .15].
, [5, .20], [10, .15].
|
2. , [5, .21], [10, .17].
1
[5, .11], [10, .13].
[5, .10].
[5, .12], [10, .14].
[5, .20, 21], [10, .15].
[5, .12].
[5, .35], [10, .17].
1
1 ( ). N. ? , .
2 ( ). . , : ) , (.13); ) (. 14).
|
|
|
3. α , . α 
, . , α.
.
4. 11 11 (. 16). ,
Δ = Δ 111.
.
1. 11 .
2. Δ = Δ 111.
5. ABCD. : ) D;
) D?
.
)
1. 1- DM,
6- D,
3- M,
5- .
2. 1 6 || 3 5.
) 12 || 43.
6. . , , , F , , , . F?
.
1. .
2. ||, EF||MB.
3. || EF.
7. 20 M, H, K, P AD DC, BC AB. MHKP, =8, =32.
.
1. .
2. .
3. .
: 48 .
8. , A, B, C, D, . , , AB CD, AD BC .
.
1. .
2. ,
NKMF .
3. NM KF.
9. ABCDEF . , EF, D, . CD AF?
. 1. MKNP . 2. AC || FD. 3. AC = FD. 4. FACD . 5. .
10. ABC KMNP EF, KP || MN, EF || AC. ,
) || KP; ) KP MN, :MN=3:5, =16 .
.
) EF || KP, EF ||AC. .
) 1. EF.
2. MN
.
3.
: 6 , 10 .
