a |
3 |
b |
a |
b |
a |
b |
a |
b |
a |
b) |
a |
b |
a |
b |
a |
a |
b |
a |
b |
a |
b |
3 |
a |
b |
(
|
|
7 |
a |
b |
a |
b |
3 |
3 |
a |
b) |
a |
b |
a |
a |
b |
b |
3 |
3 |
a |
b |
a |
b |
a |
a |
a |
b |
a |
a |
b |
3 |
| ||
2 |
π |
6 |
a |
b |
a |
b |
a |
a |
b |
A.45° | B.60° | C.120° | D.135° |
AB |
AE |
AC |
AF |
EF |
BC |
i |
j |
a |
i |
j |
b |
i |
j |
a |
b |
a |
b |
2 |
a |
b |
a |
a |
b |
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