a |
b |
a |
b |
a |
b |
a |
A.30° | B.60° | C.120° | D.150° |
a |
a |
b |
a |
b |
a |
b |
1 |
2 |
a |
b |
b |
a |
a |
b |
a |
b |
a |
b |
a |
b |
b |
b |
a |
b |
A.30° | B.45° | C.60° | D.120° |
a |
b |
a |
b |
2 |
3 |
AB |
AC |
A.450 | B.1350 | C.810 | D.990 |
OA |
OB |
π |
6 |
2π |
3 |
OC |
OA |
OB |
OC |
0 |
OC |
A.(0,
| B.(
| C.(
| D.(
|
a |
b |
2 |
a |
b |
| ||
2 |
a |
b |
a |
b |
a |
b |
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