a |
i |
i |
k |
b |
i |
j |
k |
a |
b |
A.-1 | B.-3 | C.-5 | D.-15 |
i |
j |
i |
j |
j |
k |
a |
b |
i |
j |
k |
i |
j |
k |
i |
j |
k |
PA |
PB |
PB |
PC |
PC |
PA |
A.-
| B.-
| C.-
| D.-
|
a |
π |
4 |
π |
4 |
b |
π |
4 |
π |
4 |
a |
b |
a |
b |
7π |
12 |
a |
b |
a |
b |
a |
b |
a |
b |
a |
b |
a |
AB |
AC |
AC |
AD |
AB |
AD |
AB |
BC |
CA |
AB |
BC |
BC |
CA |
CA |
AB |
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