p |
a |
b |
c |
p |
a |
b |
b |
c |
c |
a |
A.(3,4,5) | B.(0,1,2) | C.(1,0,2) | D.(0,2,1) |
p |
a |
b |
c |
p |
a |
b |
b |
c |
c |
a |
p |
a |
b |
c |
a |
b |
b |
c |
c |
a |
a |
b |
c |
a |
b |
c |
|
p |
a |
b |
b |
c |
c |
a |
PQ |
A.(2,0,10) | B.(0,-6,0) | C.(0,6,0) | D.(-2,0,-10) |
OG |
OA |
OB, |
OC |
OG |
AC′ |
AB |
BC |
C′C |
MA |
MB |
MC |
MA |
MB |
MC |
A.
| B.
| ||||||||||||||||||||
C.
| D.
|
a |
b |
c |
a |
b |
c |
a |
b |
c |
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