a |
b |
c |
a| |
b |
a |
b |
a |
b |
π |
6 |
a |
c |
b |
c |
b |
c |
b |
A.
| B.
| C.2 | D.1 |
a| |
OA |
a |
b |
a |
b |
OB |
b |
OC |
c |
a |
c |
b |
c |
CA |
CB |
a |
b |
a |
b |
A.
| B.
| C.
| D.
|
a |
b |
a |
a |
b |
a |
b |
3 |
4 |
b |
a |
b |
1 |
4 |
a |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
A.30° | B.60° | C.120° | D.150° |
AB |
AC |
AB |
AC |
π |
4 |
3 |
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