a |
1 |
2 |
| ||
2 |
b |
c |
a |
b |
c |
0 |
a |
b |
c |
a |
b |
b |
c |
a |
b |
c |
a |
b |
a |
b |
b |
a |
a |
b |
c |
a |
b |
c |
0 |
c |
a |
b |
b |
c |
a |
b |
a |
b |
b |
c |
a |
b |
b |
c |
a |
b |
a |
b |
a |
b |
1 |
2 |
| ||
2 |
a |
b |
|
a |
3 |
2 |
b |
1 |
3 |
a |
b |
A.60° | B.30° | C.75° | D.45° |
a |
b |
a |
b |
c |
a |
b |
c |
a |
c |
b |
a |
d |
d |
b |
a |
c |
d |
a |
26 |
d |
a |
b |
a |
b |
c |
a |
b |
d |
a |
b |
c |
d |
c |
d |
a |
3 |
b |
a |
b |
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