a |
AB |
a |
A.(-2,-4,-6) | B.(2,4,6) | C.(2,3,6) | D.(-2,-3,-6) |
AB |
a |
a |
a |
b |
b |
A.(2,-4,2) | B.(-2,4,-2) | C.(-2,0,-2) | D.(2,1,-3) |
a |
b |
b |
a |
AC1 |
AB |
BC |
CC1 |
AE |
AA1 |
AB |
AD |
AF |
AD |
AB |
AA1 |
OP |
OA |
| ||
|
|
| ||
|
|
A.外心 | B.内心 | C.重心 | D.垂心 |
A1B1 |
a |
A1D1 |
b |
AA1 |
c |
B1O |
A.
| B.
| C.-
| D.-
|
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