OA |
a |
OB |
b |
OC |
c |
OD |
a |
b |
c |
A.
| B.
| C.-
| D.
|
CD |
1 |
2 |
BA |
OD |
OA |
AC |
CD |
OA |
OC |
OA |
1 |
2 |
BA |
OC |
1 |
2 |
OA |
OB |
1 |
2 |
a |
1 |
2 |
b |
c |
AB |
a |
AD |
b |
OB |
BP |
PC |
PA |
PQ |
BC |
A.(6,-21) | B.(2,-7) | C.(-2,-7) | D.(-6,21) |
MA |
MB |
MC |
0 |
CA |
CB |
CM |
A.2 | B.3 | C.4 | D.5 |
a |
b |
a |
b |
c |
a |
b |
c |
a |
c |
b |
c |
a |
b |
a |
c |
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