. |
BC |
. |
e1 |
. |
DC |
e2 |
OC |
A.
| B.
| ||||||||||||
C.
| D.-
|
OC |
1 |
2 |
AC |
AC |
AB |
BC |
AB |
DC |
. |
BC |
. |
e1 |
. |
DC |
e2 |
OC |
1 |
2 |
. |
e1 |
. |
e2 |
m |
n |
p |
m |
n |
m |
p |
π |
3 |
a |
b |
a |
b |
OA |
a |
OB |
b |
OC |
c |
OD |
a |
b |
c |
A.
| B.
| C.-
| D.
|
AB |
a |
AD |
b |
OB |
BP |
PC |
PA |
PQ |
BC |
A.(6,-21) | B.(2,-7) | C.(-2,-7) | D.(-6,21) |
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