AB |
AE |
AC |
AF |
EF |
BC |
BC |
AC |
AB |
AC |
AB |
AC |
AB |
AC |
AB |
AC |
AB |
1 |
2 |
AB |
AE |
AC |
AF |
AB |
AB |
BE |
AC |
AB |
BF |
AB |
AB |
BE |
AC |
AB |
AC |
BF |
AB |
BF |
1 |
2 |
AC |
BF |
3 |
2 |
BF |
AC |
AB |
3 |
2 |
1 |
2 |
EF |
BC |
EF |
BC |
EF |
BC |
EF |
BC |
1 |
2 |
EF |
BC |
π |
3 |
π |
3 |
i |
j |
a |
i |
j |
b |
i |
j |
a |
b |
a |
b |
2 |
a |
b |
a |
a |
b |
a |
b |
a |
b |
a |
b |
3 |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
A.30° | B.60° | C.90° | D.120° |
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